diff --git a/.gitignore b/.gitignore
index 003c6f9..9db059d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -130,5 +130,3 @@ fabric.properties
 
 # Dependency directories (remove the comment below to include it)
 # vendor/
-
-dist/
diff --git a/.goreleaser.yml b/.goreleaser.yml
deleted file mode 100644
index a0ee28a..0000000
--- a/.goreleaser.yml
+++ /dev/null
@@ -1,87 +0,0 @@
-version: 2
-project_name: "librespeed-cli"
-#dist: ./out
-before:
-  hooks:
-    - go mod download
-builds:
-  - main: ./main.go
-    id: upx
-    env:
-      - CGO_ENABLED=0
-    flags:
-      - -trimpath
-    ldflags:
-      - -w -s -X "librespeed-cli/defs.ProgName={{ .ProjectName }}" -X "librespeed-cli/defs.ProgVersion=v{{ .Version }}" -X "librespeed-cli/defs.BuildDate={{ .Date }}"
-    goos:
-      - linux
-      - darwin
-      - freebsd
-    goarch:
-      - "386"
-      - amd64
-      - arm
-      - arm64
-    goarm:
-      - "5"
-      - "6"
-      - "7"
-    ignore:
-      - goos: darwin
-        goarch: "386"
-      - goos: darwin
-        goarch: arm64
-    hooks:
-      post:
-        - ./upx.sh -9 "{{ .Path }}"
-  - main: ./main.go
-    id: no-upx
-    env:
-      - CGO_ENABLED=0
-    flags:
-      - -trimpath
-    ldflags:
-      - -w -s -X "librespeed-cli/defs.ProgName={{ .ProjectName }}" -X "librespeed-cli/defs.ProgVersion=v{{ .Version }}" -X "librespeed-cli/defs.BuildDate={{ .Date }}"
-    goos:
-      - linux
-      - windows
-      - darwin
-    goarch:
-      - "386"
-      - amd64
-      - arm64
-      - mips
-      - mipsle
-      - mips64
-      - mips64le
-      - riscv64
-    gomips:
-      - hardfloat
-      - softfloat
-    ignore:
-      - goos: linux
-        goarch: "386"
-      - goos: linux
-        goarch: amd64
-      - goos: linux
-        goarch: arm64
-      - goos: darwin
-        goarch: "386"
-      - goos: darwin
-        goarch: amd64
-archives:
-  - format_overrides:
-      - goos: windows
-        formats: ['zip']
-    files:
-      - LICENSE
-checksum:
-  name_template: "checksums.txt"
-changelog:
-  disable: false
-  sort: asc
-release:
-  github:
-    owner: librespeed
-    name: speedtest-cli
-  disable: false
diff --git a/README.md b/README.md
index d3945cf..a28a594 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 ![LibreSpeed Logo](https://github.com/librespeed/speedtest/blob/master/.logo/logo3.png?raw=true)
 
 # LibreSpeed command line tool
-Don't have a GUI but want to use LibreSpeed servers to test your Internet speed? 🚀
+Don't have a GUI but wants to use LibreSpeed servers to test your Internet speed? 🚀
 
 `librespeed-cli` comes to rescue!
 
@@ -22,19 +22,14 @@ This is a command line interface for LibreSpeed speed test backends, written in
 [![asciicast](https://asciinema.org/a/J17bUAilWI3qR12JyhfGvPwu2.svg)](https://asciinema.org/a/J17bUAilWI3qR12JyhfGvPwu2)
 
 ## Requirements for compiling
-- Go 1.18+
+- Go 1.14
 
 ## Runtime requirements
 - Any [Go supported platforms](https://github.com/golang/go/wiki/MinimumRequirements)
 
-## Use prebuilt binaries
-
-If you don't want to build `librespeed-cli` yourself, you can find different binaries compiled for various platforms in
-the [releases page](https://github.com/librespeed/speedtest-cli/releases).
-
 ## Building `librespeed-cli`
 
-1. First, you'll have to install Go (at least version 1.11). For Windows users, [you can download an installer from golang.org](https://golang.org/dl/).
+1. First, you'll have to install Go. For Windows users, [you can download an installer from golang.org](https://golang.org/dl/).
 For Linux users, you can use either the archive from golang.org, or install from your distribution's package manager.
 
     For example, Arch Linux:
@@ -42,7 +37,7 @@ For Linux users, you can use either the archive from golang.org, or install from
     ```shell script
     # pacman -S go
     ```
-
+   
 2. Then, clone the repository:
 
     ```shell script
@@ -59,10 +54,7 @@ can now proceed to build `librespeed-cli` with the build script:
 
     If you want to build for another operating system or system architecture, use the `GOOS` and `GOARCH` environment
     variables. Run `go tool dist list` to get a list of possible combinations of `GOOS` and `GOARCH`.
-
-    Note: Technically, the CLI can be compiled with older Go versions that support Go modules, with `GO111MODULE=on`
-    set. If you're compiling with an older Go runtime, you might have to change the Go version in `go.mod`.
-
+    
     ```shell script
     # Let's say we're building for 64-bit Windows on Linux
     $ GOOS=windows GOARCH=amd64 ./build.sh
@@ -74,68 +66,18 @@ can now proceed to build `librespeed-cli` with the build script:
     $ ls out
     librespeed-cli-windows-amd64.exe
     ```
-
+   
 5. Now you can use the `librespeed-cli` and test your Internet speed!
 
-## Install from AUR
+## Install from AUR/Homebrew
 
-To install `librespeed-cli` from AUR, use your favorite AUR helper and install package `librespeed-cli-bin`
-
-```shell script
-$ yay librespeed-cli-bin
-```
-
-... or, clone it and build it yourself:
-
-```shell script
-$ git clone https://aur.archlinux.org/librespeed-cli-bin.git
-$ cd librespeed-cli-bin
-$ makepkg -si
-```
-
-## Install from Homebrew
-
-See the [librespeed-cli Homebrew tap](https://github.com/librespeed/homebrew-tap#setup).
-
-## Install on Windows
-
-If you have either [Scoop](https://scoop.sh/) or [Chocolatey](https://chocolatey.org/) installed you can use one of the following commands:
-
-- Scoop (ensure you have the `extras` bucket added):
-  ```
-  > scoop install librespeed-cli
-  ```
-
-- Chocolatey:
-  ```
-  > choco install librespeed-cli
-  ```
-
-## Container Image
-
-You can run `librespeed-cli` in a container.
-
-1. Build the container image:
-
-    ```shell script
-    docker build -t librespeed-cli:latest .
-    ```
-
-2. Run the container:
-
-    ```shell script
-    docker run --rm --name librespeed-cli librespeed-cli:latest
-    # With options
-    docker run --rm --name librespeed-cli librespeed-cli:latest --telemetry-level disabled --no-upload
-    # To avoid "Failed to ping target host: socket: permission denied" errors when using --verbose
-    docker run --rm --name librespeed-cli --sysctl net.ipv4.ping_group_range="0 2147483647" librespeed-cli:latest --verbose
-    ```
+TODO
 
 ## Usage
 
 You can see the full list of supported options with `librespeed-cli -h`:
 
-```
+```shell script
 $ librespeed-cli -h
 NAME:
    librespeed-cli - Test your Internet speed with LibreSpeed 🚀
@@ -146,67 +88,50 @@ USAGE:
 GLOBAL OPTIONS:
    --help, -h                     show help (default: false)
    --version                      Show the version number and exit (default: false)
-   --ipv4, -4                     Force IPv4 only (default: false)
-   --ipv6, -6                     Force IPv6 only (default: false)
    --no-download                  Do not perform download test (default: false)
    --no-upload                    Do not perform upload test (default: false)
-   --no-icmp                      Do not use ICMP ping. ICMP doesn't work well under Linux
-                                  at this moment, so you might want to disable it (default: false)
-   --concurrent value             Concurrent HTTP requests being made (default: 3)
    --bytes                        Display values in bytes instead of bits. Does not affect
                                   the image generated by --share, nor output from
                                   --json or --csv (default: false)
-   --mebibytes                    Use 1024 bytes as 1 kilobyte instead of 1000 (default: false)
    --distance value               Change distance unit shown in ISP info, use 'mi' for miles,
                                   'km' for kilometres, 'NM' for nautical miles (default: "km")
    --share                        Generate and provide a URL to the LibreSpeed.org share results
                                   image, not displayed with --csv (default: false)
    --simple                       Suppress verbose output, only show basic information
-                                  (default: false)
+                                   (default: false)
    --csv                          Suppress verbose output, only show basic information in CSV
                                   format. Speeds listed in bit/s and not affected by --bytes
-                                  (default: false)
+                                   (default: false)
    --csv-delimiter CSV_DELIMITER  Single character delimiter (CSV_DELIMITER) to use in
                                   CSV output. (default: ",")
    --csv-header                   Print CSV headers (default: false)
    --json                         Suppress verbose output, only show basic information
                                   in JSON format. Speeds listed in bit/s and not
-                                  affected by --bytes (default: false)
+                                   affected by --bytes (default: false)
    --list                         Display a list of LibreSpeed.org servers (default: false)
    --server SERVER                Specify a SERVER ID to test against. Can be supplied
                                   multiple times. Cannot be used with --exclude
    --exclude EXCLUDE              EXCLUDE a server from selection. Can be supplied
                                   multiple times. Cannot be used with --server
    --server-json value            Use an alternative server list from remote JSON file
-   --local-json value             Use an alternative server list from local JSON file,
-                                  or read from stdin with "--local-json -".
-   --source SOURCE                SOURCE IP address to bind to. Incompatible with --interface.
-   --interface INTERFACE          The name of the network interface to bind to. Example: "enp0s3".
-                                  Not supported on Windows and incompatible with --source.
-                                  Implies --no-icmp.
+   --local-json value             Use an alternative server list from local JSON file
+   --source SOURCE                SOURCE IP address to bind to
    --timeout TIMEOUT              HTTP TIMEOUT in seconds. (default: 15)
-   --duration value               Upload and download test duration in seconds (default: 15)
-   --chunks value                 Chunks to download from server, chunk size depends on server configuration (default: 100)
-   --upload-size value            Size of payload being uploaded in KiB (default: 1024)
    --secure                       Use HTTPS instead of HTTP when communicating with
                                   LibreSpeed.org operated servers (default: false)
-   --ca-cert value                Use the specified CA certificate PEM bundle file instead
-                                  of the system certificate trust store
-   --skip-cert-verify             Skip verifying SSL certificate for HTTPS connections (self-signed certs) (default: false)
    --no-pre-allocate              Do not pre allocate upload data. Pre allocation is
                                   enabled by default to improve upload performance. To
                                   support systems with insufficient memory, use this
                                   option to avoid out of memory errors (default: false)
    --telemetry-json value         Load telemetry server settings from a JSON file. This
                                   options overrides --telemetry-level, --telemetry-server,
-                                  --telemetry-path, and --telemetry-share. Implies --share
+                                  --telemetry-path, and --telemetry-share
    --telemetry-level value        Set telemetry data verbosity, available values are:
-                                  disabled, basic, full, debug. Implies --share
-   --telemetry-server value       Set the telemetry server base URL. Implies --share
-   --telemetry-path value         Set the telemetry upload path. Implies --share
-   --telemetry-share value        Set the telemetry share link path. Implies --share
-   --telemetry-extra value        Send a custom message along with the telemetry results.
-                                  Implies --share
+                                  disabled, basic, full, debug
+   --telemetry-server value       Set the telemetry server base URL
+   --telemetry-path value         Set the telemetry upload path
+   --telemetry-share value        Set the telemetry share link path
+   --telemetry-extra value        Send a custom message along with the telemetry results
 ```
 
 ## Use a custom backend server list
@@ -216,7 +141,6 @@ locally via `--local-json`). The format is as below:
 ```json
 [
   {
-    "id": 1,
     "name": "PHP Backend",
     "server": "https://example.com/",
     "dlURL": "garbage.php",
@@ -225,7 +149,6 @@ locally via `--local-json`). The format is as below:
     "getIpURL": "getIP.php"
   },
   {
-    "id": 2,
     "name": "Go Backend",
     "server": "http://example.com/speedtest/",
     "dlURL": "garbage",
@@ -236,15 +159,11 @@ locally via `--local-json`). The format is as below:
 ]
 ```
 
-The `--local-json` option can also read from `stdin`:
-
-`echo '[{"id": 1,"name": "a","server": "https://speedtest.example.com/","dlURL": "garbage.php","ulURL": "empty.php","pingURL": "empty.php","getIpURL": "getIP.php"}]' | librespeed-cli --local-json - `
-
 As you can see in the example, all servers have their schemes defined. In case of undefined scheme (e.g. `//example.com`),
 `librespeed-cli` will use `http` by default, or `https` when the `--secure` option is enabled.
 
 ## Use a custom telemetry server
-By default, the telemetry result will be sent to `librespeed.org`. You can also customize your telemetry settings
+By default, the telemetry result will be sent to `librespeed.org` by default. You can also customize your telemetry settings 
 via the `--telemetry` prefixed options. In order to load a custom telemetry endpoint configuration, you'll have to use the
 `--telemetry-json` option to specify a local JSON file containing the configuration bits. The format is as below:
 
diff --git a/build.sh b/build.sh
index b06797a..ca51d85 100755
--- a/build.sh
+++ b/build.sh
@@ -10,10 +10,9 @@ CURRENT_DIR=$(pwd)
 OUT_DIR=${CURRENT_DIR}/out
 
 PROGNAME="librespeed-cli"
-DEFS_PATH="github.com/librespeed/speedtest-cli"
 BINARY=${PROGNAME}-$(go env GOOS)-$(go env GOARCH)
 BUILD_DATE=$(date -u "+%Y-%m-%d %H:%M:%S %Z")
-LDFLAGS="-w -s -X \"${DEFS_PATH}/defs.ProgName=${PROGNAME}\" -X \"${DEFS_PATH}/defs.ProgVersion=${PROGVER}\" -X \"${DEFS_PATH}/defs.BuildDate=${BUILD_DATE}\""
+LDFLAGS="-w -s -X \"librespeed-cli/defs.ProgName=${PROGNAME}\" -X \"librespeed-cli/defs.ProgVersion=${PROGVER}\" -X \"librespeed-cli/defs.BuildDate=${BUILD_DATE}\""
 
 if [[ -n "${GOARM}" ]] && [[ "${GOARM}" -gt 0 ]]; then
   BINARY=${BINARY}v${GOARM}
diff --git a/defs/bytes_counter.go b/defs/bytes_counter.go
index 64c155b..9894d1b 100644
--- a/defs/bytes_counter.go
+++ b/defs/bytes_counter.go
@@ -6,35 +6,21 @@ import (
 	"fmt"
 	"io"
 	"log"
-	"sync"
 	"time"
 )
 
 // BytesCounter implements io.Reader and io.Writer interface, for counting bytes being read/written in HTTP requests
 type BytesCounter struct {
-	start      time.Time
-	pos        int
-	total      uint64
-	payload    []byte
-	reader     io.ReadSeeker
-	mebi       bool
-	uploadSize int
-
-	lock *sync.Mutex
-}
-
-func NewCounter() *BytesCounter {
-	return &BytesCounter{
-		lock: &sync.Mutex{},
-	}
+	start   time.Time
+	total   int
+	payload []byte
+	reader  io.ReadSeeker
 }
 
 // Write implements io.Writer
 func (c *BytesCounter) Write(p []byte) (int, error) {
 	n := len(p)
-	c.lock.Lock()
-	c.total += uint64(n)
-	c.lock.Unlock()
+	c.total += n
 
 	return n, nil
 }
@@ -42,71 +28,43 @@ func (c *BytesCounter) Write(p []byte) (int, error) {
 // Read implements io.Reader
 func (c *BytesCounter) Read(p []byte) (int, error) {
 	n, err := c.reader.Read(p)
-	c.lock.Lock()
-	c.total += uint64(n)
-	c.pos += n
-	if c.pos == c.uploadSize {
-		c.resetReader()
-	}
-	c.lock.Unlock()
+	c.total += n
 
 	return n, err
 }
 
-// SetBase sets the base for dividing bytes into megabyte or mebibyte
-func (c *BytesCounter) SetMebi(mebi bool) {
-	c.mebi = mebi
-}
-
-// SetUploadSize sets the size of payload being uploaded
-func (c *BytesCounter) SetUploadSize(uploadSize int) {
-	c.uploadSize = uploadSize * 1024
-}
-
-// AvgBytes returns the average bytes/second
-func (c *BytesCounter) AvgBytes() float64 {
+// Average returns the average bytes/second
+func (c *BytesCounter) Average() float64 {
 	return float64(c.total) / time.Now().Sub(c.start).Seconds()
 }
 
-// AvgMbps returns the average mbits/second
-func (c *BytesCounter) AvgMbps() float64 {
-	var base float64 = 125000
-	if c.mebi {
-		base = 131072
-	}
-	return c.AvgBytes() / base
+func (c *BytesCounter) AvgMbits() string {
+	return fmt.Sprintf("%.02f Mbps", c.Average()/131072)
 }
 
-// AvgHumanize returns the average bytes/kilobytes/megabytes/gigabytes (or bytes/kibibytes/mebibytes/gibibytes) per second
 func (c *BytesCounter) AvgHumanize() string {
-	val := c.AvgBytes()
+	val := c.Average()
 
-	var base float64 = 1000
-	if c.mebi {
-		base = 1024
-	}
-
-	if val < base {
+	if val < 1024 {
 		return fmt.Sprintf("%.2f bytes/s", val)
-	} else if val/base < base {
-		return fmt.Sprintf("%.2f KB/s", val/base)
-	} else if val/base/base < base {
-		return fmt.Sprintf("%.2f MB/s", val/base/base)
+	} else if val/1024 < 1024 {
+		return fmt.Sprintf("%.2f KB/s", val/1024)
+	} else if val/1024/1024 < 1024 {
+		return fmt.Sprintf("%.2f MB/s", val/1024/1024)
 	} else {
-		return fmt.Sprintf("%.2f GB/s", val/base/base/base)
+		return fmt.Sprintf("%.2f GB/s", val/1024/1024/1024)
 	}
 }
 
 // GenerateBlob generates a random byte array of `uploadSize` in the `payload` field, and sets the `reader` field to
 // read from it
 func (c *BytesCounter) GenerateBlob() {
-	c.payload = getRandomData(c.uploadSize)
+	c.payload = getRandomData(uploadSize)
 	c.reader = bytes.NewReader(c.payload)
 }
 
-// resetReader resets the `reader` field to 0 position
-func (c *BytesCounter) resetReader() (int64, error) {
-	c.pos = 0
+// ResetReader resets the `reader` field to 0 position
+func (c *BytesCounter) ResetReader() (int64, error) {
 	return c.reader.Seek(0, 0)
 }
 
@@ -116,7 +74,7 @@ func (c *BytesCounter) Start() {
 }
 
 // Total returns the total bytes read/written
-func (c *BytesCounter) Total() uint64 {
+func (c *BytesCounter) Total() int {
 	return c.total
 }
 
diff --git a/defs/defs.go b/defs/defs.go
index ad1cb46..0197cfa 100644
--- a/defs/defs.go
+++ b/defs/defs.go
@@ -1,5 +1,12 @@
 package defs
 
+const (
+	// chunks to download in download test
+	downloadChunks = 100
+	// payload size per upload request
+	uploadSize = 1024 * 1024
+)
+
 var (
 	// values to be filled in by build script
 	BuildDate   string
diff --git a/defs/options.go b/defs/options.go
index 84662b5..f637490 100644
--- a/defs/options.go
+++ b/defs/options.go
@@ -2,16 +2,9 @@ package defs
 
 const (
 	OptionHelp            = "help"
-	OptionIPv4            = "ipv4"
-	OptionIPv4Alt         = "4"
-	OptionIPv6            = "ipv6"
-	OptionIPv6Alt         = "6"
 	OptionNoDownload      = "no-download"
 	OptionNoUpload        = "no-upload"
-	OptionNoICMP          = "no-icmp"
-	OptionConcurrent      = "concurrent"
 	OptionBytes           = "bytes"
-	OptionMebiBytes       = "mebibytes"
 	OptionDistance        = "distance"
 	OptionShare           = "share"
 	OptionSimple          = "simple"
@@ -24,14 +17,8 @@ const (
 	OptionExclude         = "exclude"
 	OptionServerJSON      = "server-json"
 	OptionSource          = "source"
-	OptionInterface       = "interface"
 	OptionTimeout         = "timeout"
-	OptionChunks          = "chunks"
-	OptionUploadSize      = "upload-size"
-	OptionDuration        = "duration"
 	OptionSecure          = "secure"
-	OptionCACert          = "ca-cert"
-	OptionSkipCertVerify  = "skip-cert-verify"
 	OptionNoPreAllocate   = "no-pre-allocate"
 	OptionVersion         = "version"
 	OptionLocalJSON       = "local-json"
@@ -42,5 +29,4 @@ const (
 	OptionTelemetryPath   = "telemetry-path"
 	OptionTelemetryShare  = "telemetry-share"
 	OptionTelemetryExtra  = "telemetry-extra"
-	OptionFwmark          = "fwmark"
 )
diff --git a/defs/server.go b/defs/server.go
index ed2ffad..48f54d5 100644
--- a/defs/server.go
+++ b/defs/server.go
@@ -16,24 +16,20 @@ import (
 	"time"
 
 	"github.com/briandowns/spinner"
-	"github.com/go-ping/ping"
 	log "github.com/sirupsen/logrus"
+	"github.com/sparrc/go-ping"
 )
 
 // Server represents a speed test server
 type Server struct {
-	ID          int    `json:"id"`
-	Name        string `json:"name"`
-	Server      string `json:"server"`
-	DownloadURL string `json:"dlURL"`
-	UploadURL   string `json:"ulURL"`
-	PingURL     string `json:"pingURL"`
-	GetIPURL    string `json:"getIpURL"`
-	SponsorName string `json:"sponsorName"`
-	SponsorURL  string `json:"sponsorURL"`
-
-	NoICMP bool         `json:"-"`
-	TLog   TelemetryLog `json:"-"`
+	Name        string       `json:"name"`
+	Server      string       `json:"server"`
+	DownloadURL string       `json:"dlURL"`
+	UploadURL   string       `json:"ulURL"`
+	PingURL     string       `json:"pingURL"`
+	GetIPURL    string       `json:"getIpURL"`
+	ICMPFail    bool         `json:"-"`
+	TLog        TelemetryLog `json:"-"`
 }
 
 // IsUp checks the speed test backend is up by accessing the ping URL
@@ -45,37 +41,25 @@ func (s *Server) IsUp() bool {
 
 	u, _ := s.GetURL()
 	u.Path = path.Join(u.Path, s.PingURL)
-
-	req, err := http.NewRequest(http.MethodGet, u.String(), nil)
+	resp, err := http.Get(u.String())
 	if err != nil {
-		log.Debugf("Failed when creating HTTP request: %s", err)
-		return false
-	}
-	req.Header.Set("User-Agent", UserAgent)
-
-	resp, err := http.DefaultClient.Do(req)
-	if err != nil {
-		log.Debugf("Error checking for server status: %s", err)
 		return false
 	}
 	defer resp.Body.Close()
 	b, _ := ioutil.ReadAll(resp.Body)
-	if len(b) > 0 {
-		log.Debugf("Failed when parsing get IP result: %s", b)
-	}
 	// only return online if the ping URL returns nothing and 200
-	return resp.StatusCode == http.StatusOK
+	return len(b) == 0 && resp.StatusCode == http.StatusOK
 }
 
 // ICMPPingAndJitter pings the server via ICMP echos and calculate the average ping and jitter
-func (s *Server) ICMPPingAndJitter(count int, srcIp, network string) (float64, float64, error) {
+func (s *Server) ICMPPingAndJitter(count int, srcIp string) (float64, float64, error) {
 	t := time.Now()
 	defer func() {
 		s.TLog.Logf("ICMP ping took %s", time.Now().Sub(t).String())
 	}()
 
-	if s.NoICMP {
-		log.Debugf("Skipping ICMP for server %s, will use HTTP ping", s.Name)
+	if s.ICMPFail {
+		log.Debug("ICMP ping failed already, using HTTP ping")
 		return s.PingAndJitter(count + 2)
 	}
 
@@ -84,9 +68,12 @@ func (s *Server) ICMPPingAndJitter(count int, srcIp, network string) (float64, f
 		log.Debugf("Failed to get server URL: %s", err)
 		return 0, 0, err
 	}
+	p, err := ping.NewPinger(u.Hostname())
+	if err != nil {
+		log.Debugf("Failed to initialize pinger: %s", err)
+		return 0, 0, err
+	}
 
-	p := ping.New(u.Hostname())
-	p.SetNetwork(network)
 	p.Count = count
 	p.Timeout = time.Duration(count) * time.Second
 	if srcIp != "" {
@@ -119,7 +106,7 @@ func (s *Server) ICMPPingAndJitter(count int, srcIp, network string) (float64, f
 	}
 
 	if len(stats.Rtts) == 0 {
-		s.NoICMP = true
+		s.ICMPFail = true
 		log.Debugf("No ICMP pings returned for server %s (%s), trying TCP ping", s.Name, u.Hostname())
 		return s.PingAndJitter(count + 2)
 	}
@@ -127,7 +114,7 @@ func (s *Server) ICMPPingAndJitter(count int, srcIp, network string) (float64, f
 	return float64(stats.AvgRtt.Milliseconds()), jitter, nil
 }
 
-// PingAndJitter pings the server via accessing ping URL and calculate the average ping and jitter
+// ICMPPingAndJitter pings the server via accessing ping URL and calculate the average ping and jitter
 func (s *Server) PingAndJitter(count int) (float64, float64, error) {
 	t := time.Now()
 	defer func() {
@@ -170,9 +157,9 @@ func (s *Server) PingAndJitter(count int) (float64, float64, error) {
 	}
 
 	var lastPing, jitter float64
-	for idx, p := range pings {
+	for idx, ping := range pings {
 		if idx != 0 {
-			instJitter := math.Abs(lastPing - p)
+			instJitter := math.Abs(lastPing - ping)
 			if idx > 1 {
 				if jitter > instJitter {
 					jitter = jitter*0.7 + instJitter*0.3
@@ -181,21 +168,20 @@ func (s *Server) PingAndJitter(count int) (float64, float64, error) {
 				}
 			}
 		}
-		lastPing = p
+		lastPing = ping
 	}
 
 	return getAvg(pings), jitter, nil
 }
 
 // Download performs the actual download test
-func (s *Server) Download(silent bool, useBytes, useMebi bool, requests int, chunks int, duration time.Duration) (float64, uint64, error) {
+func (s *Server) Download(silent bool, useBytes bool) (float64, int, error) {
 	t := time.Now()
 	defer func() {
 		s.TLog.Logf("Download took %s", time.Now().Sub(t).String())
 	}()
 
-	counter := NewCounter()
-	counter.SetMebi(useMebi)
+	counter := &BytesCounter{}
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
@@ -213,12 +199,12 @@ func (s *Server) Download(silent bool, useBytes, useMebi bool, requests int, chu
 		return 0, 0, err
 	}
 	q := req.URL.Query()
-	q.Set("ckSize", strconv.Itoa(chunks))
+	q.Set("ckSize", strconv.Itoa(downloadChunks))
 	req.URL.RawQuery = q.Encode()
 	req.Header.Set("User-Agent", UserAgent)
 	req.Header.Set("Accept-Encoding", "identity")
 
-	downloadDone := make(chan struct{}, requests)
+	downloadDone := make(chan struct{})
 
 	doDownload := func() {
 		resp, err := http.DefaultClient.Do(req)
@@ -228,7 +214,7 @@ func (s *Server) Download(silent bool, useBytes, useMebi bool, requests int, chu
 			defer resp.Body.Close()
 
 			if _, err = io.Copy(ioutil.Discard, io.TeeReader(resp.Body, counter)); err != nil {
-				if !errors.Is(err, context.Canceled) && !errors.Is(err, context.DeadlineExceeded) {
+				if !errors.Is(err, context.Canceled) {
 					log.Debugf("Failed when reading HTTP response: %s", err)
 				}
 			}
@@ -245,7 +231,7 @@ func (s *Server) Download(silent bool, useBytes, useMebi bool, requests int, chu
 			if useBytes {
 				s.Suffix = fmt.Sprintf("  %s", counter.AvgHumanize())
 			} else {
-				s.Suffix = fmt.Sprintf("  %.2f Mbps", counter.AvgMbps())
+				s.Suffix = fmt.Sprintf("  %s", counter.AvgMbits())
 			}
 		}
 
@@ -254,17 +240,14 @@ func (s *Server) Download(silent bool, useBytes, useMebi bool, requests int, chu
 			if useBytes {
 				pb.FinalMSG = fmt.Sprintf("Download rate:\t%s\n", counter.AvgHumanize())
 			} else {
-				pb.FinalMSG = fmt.Sprintf("Download rate:\t%.2f Mbps\n", counter.AvgMbps())
+				pb.FinalMSG = fmt.Sprintf("Download rate:\t%s\n", counter.AvgMbits())
 			}
 			pb.Stop()
 		}()
 	}
 
-	for i := 0; i < requests; i++ {
-		go doDownload()
-		time.Sleep(200 * time.Millisecond)
-	}
-	timeout := time.After(duration)
+	go doDownload()
+	timeout := time.After(15 * time.Second)
 Loop:
 	for {
 		select {
@@ -276,19 +259,17 @@ Loop:
 		}
 	}
 
-	return counter.AvgMbps(), counter.Total(), nil
+	return counter.Average() / 131072, counter.Total(), nil
 }
 
 // Upload performs the actual upload test
-func (s *Server) Upload(noPrealloc, silent, useBytes, useMebi bool, requests int, uploadSize int, duration time.Duration) (float64, uint64, error) {
+func (s *Server) Upload(noPrealloc, silent, useBytes bool) (float64, int, error) {
 	t := time.Now()
 	defer func() {
 		s.TLog.Logf("Upload took %s", time.Now().Sub(t).String())
 	}()
 
-	counter := NewCounter()
-	counter.SetMebi(useMebi)
-	counter.SetUploadSize(uploadSize)
+	counter := &BytesCounter{}
 
 	if noPrealloc {
 		log.Info("Pre-allocation is disabled, performance might be lower!")
@@ -314,11 +295,11 @@ func (s *Server) Upload(noPrealloc, silent, useBytes, useMebi bool, requests int
 	req.Header.Set("User-Agent", UserAgent)
 	req.Header.Set("Accept-Encoding", "identity")
 
-	uploadDone := make(chan struct{}, requests)
+	uploadDone := make(chan struct{})
 
 	doUpload := func() {
 		resp, err := http.DefaultClient.Do(req)
-		if err != nil && !errors.Is(err, context.Canceled) && !errors.Is(err, context.DeadlineExceeded) {
+		if err != nil && !errors.Is(err, context.Canceled) {
 			log.Debugf("Failed when making HTTP request: %s", err)
 		} else if err == nil {
 			defer resp.Body.Close()
@@ -326,6 +307,7 @@ func (s *Server) Upload(noPrealloc, silent, useBytes, useMebi bool, requests int
 				log.Debugf("Failed when reading HTTP response: %s", err)
 			}
 
+			counter.ResetReader()
 			uploadDone <- struct{}{}
 		}
 	}
@@ -338,7 +320,7 @@ func (s *Server) Upload(noPrealloc, silent, useBytes, useMebi bool, requests int
 			if useBytes {
 				s.Suffix = fmt.Sprintf("  %s", counter.AvgHumanize())
 			} else {
-				s.Suffix = fmt.Sprintf("  %.2f Mbps", counter.AvgMbps())
+				s.Suffix = fmt.Sprintf("  %s", counter.AvgMbits())
 			}
 		}
 
@@ -347,17 +329,14 @@ func (s *Server) Upload(noPrealloc, silent, useBytes, useMebi bool, requests int
 			if useBytes {
 				pb.FinalMSG = fmt.Sprintf("Upload rate:\t%s\n", counter.AvgHumanize())
 			} else {
-				pb.FinalMSG = fmt.Sprintf("Upload rate:\t%.2f Mbps\n", counter.AvgMbps())
+				pb.FinalMSG = fmt.Sprintf("Upload rate:\t%s\n", counter.AvgMbits())
 			}
 			pb.Stop()
 		}()
 	}
 
-	for i := 0; i < requests; i++ {
-		go doUpload()
-		time.Sleep(200 * time.Millisecond)
-	}
-	timeout := time.After(duration)
+	go doUpload()
+	timeout := time.After(15 * time.Second)
 Loop:
 	for {
 		select {
@@ -369,7 +348,7 @@ Loop:
 		}
 	}
 
-	return counter.AvgMbps(), counter.Total(), nil
+	return counter.Average() / 131072, counter.Total(), nil
 }
 
 // GetIPInfo accesses the backend's getIP.php endpoint and get current client's IP information
@@ -396,8 +375,6 @@ func (s *Server) GetIPInfo(distanceUnit string) (*GetIPResult, error) {
 		log.Debugf("Failed when creating HTTP request: %s", err)
 		return nil, err
 	}
-	req.Header.Set("User-Agent", UserAgent)
-
 	resp, err := http.DefaultClient.Do(req)
 	if err != nil {
 		log.Debugf("Failed when making HTTP request: %s", err)
@@ -415,7 +392,6 @@ func (s *Server) GetIPInfo(distanceUnit string) (*GetIPResult, error) {
 		if err := json.Unmarshal(b, &ipInfo); err != nil {
 			log.Debugf("Failed when parsing get IP result: %s", err)
 			log.Debugf("Received payload: %s", b)
-			ipInfo.ProcessedString = string(b[:])
 		}
 	}
 
@@ -436,24 +412,3 @@ func (s *Server) GetURL() (*url.URL, error) {
 	}
 	return u, nil
 }
-
-// Sponsor returns the sponsor's info
-func (s *Server) Sponsor() string {
-	var sponsorMsg string
-	if s.SponsorName != "" {
-		sponsorMsg += s.SponsorName
-
-		if s.SponsorURL != "" {
-			su, err := url.Parse(s.SponsorURL)
-			if err != nil {
-				log.Debugf("Sponsor URL is invalid: %s", s.SponsorURL)
-			} else {
-				if su.Scheme == "" {
-					su.Scheme = "https"
-				}
-				sponsorMsg += " @ " + su.String()
-			}
-		}
-	}
-	return sponsorMsg
-}
diff --git a/dockerfile b/dockerfile
deleted file mode 100644
index 944de29..0000000
--- a/dockerfile
+++ /dev/null
@@ -1,19 +0,0 @@
-FROM golang:1.20.3-alpine as builder
-
-RUN apk add --no-cache bash upx
-
-# Set working directory
-WORKDIR /usr/src/librespeed-cli
-
-# Copy librespeed-cli
-COPY . .
-
-# Build librespeed-cli
-RUN ./build.sh
-
-FROM alpine:3.17
-
-# Copy librespeed-cli binary
-COPY --from=builder /usr/src/librespeed-cli/out/librespeed-cli* /bin/librespeed-cli
-
-CMD ["/bin/librespeed-cli"]
diff --git a/go.mod b/go.mod
index da5d4ff..373c368 100644
--- a/go.mod
+++ b/go.mod
@@ -1,27 +1,15 @@
-module github.com/librespeed/speedtest-cli
+module librespeed-cli
 
-go 1.23.0
+go 1.14
 
-toolchain go1.24.2
+replace github.com/sparrc/go-ping v0.0.0-20190613174326-4e5b6552494c => github.com/maddie/go-ping v0.0.0-20200305135031-f8c069280206
 
 require (
-	github.com/briandowns/spinner v1.23.1
-	github.com/go-ping/ping v1.2.0
-	github.com/gocarina/gocsv v0.0.0-20240520201108-78e41c74b4b1
-	github.com/sirupsen/logrus v1.9.3
-	github.com/urfave/cli/v2 v2.27.4
-	golang.org/x/sys v0.33.0
-)
-
-require (
-	github.com/cpuguy83/go-md2man/v2 v2.0.4 // indirect
-	github.com/fatih/color v1.17.0 // indirect
-	github.com/google/uuid v1.6.0 // indirect
-	github.com/mattn/go-colorable v0.1.13 // indirect
-	github.com/mattn/go-isatty v0.0.20 // indirect
-	github.com/russross/blackfriday/v2 v2.1.0 // indirect
-	github.com/xrash/smetrics v0.0.0-20240521201337-686a1a2994c1 // indirect
-	golang.org/x/net v0.41.0 // indirect
-	golang.org/x/sync v0.15.0 // indirect
-	golang.org/x/term v0.32.0 // indirect
+	github.com/briandowns/spinner v1.9.0
+	github.com/gocarina/gocsv v0.0.0-20200302151839-87c60d755c58
+	github.com/sirupsen/logrus v1.4.2
+	github.com/sparrc/go-ping v0.0.0-20190613174326-4e5b6552494c
+	github.com/stretchr/testify v1.3.0 // indirect
+	github.com/urfave/cli/v2 v2.1.1
+	golang.org/x/net v0.0.0-20200226121028-0de0cce0169b // indirect
 )
diff --git a/go.sum b/go.sum
index 51dbae2..f9439a2 100644
--- a/go.sum
+++ b/go.sum
@@ -1,56 +1,48 @@
-github.com/briandowns/spinner v1.23.1 h1:t5fDPmScwUjozhDj4FA46p5acZWIPXYE30qW2Ptu650=
-github.com/briandowns/spinner v1.23.1/go.mod h1:LaZeM4wm2Ywy6vO571mvhQNRcWfRUnXOs0RcKV0wYKM=
-github.com/cpuguy83/go-md2man/v2 v2.0.4 h1:wfIWP927BUkWJb2NmU/kNDYIBTh/ziUX91+lVfRxZq4=
-github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/briandowns/spinner v1.9.0 h1:+OMAisemaHar1hjuJ3Z2hIvNhQl9Y7GLPWUwwz2Pxo8=
+github.com/briandowns/spinner v1.9.0/go.mod h1://Zf9tMcxfRUA36V23M6YGEAv+kECGfvpnLTnb8n4XQ=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/fatih/color v1.17.0 h1:GlRw1BRJxkpqUCBKzKOw098ed57fEsKeNjpTe3cSjK4=
-github.com/fatih/color v1.17.0/go.mod h1:YZ7TlrGPkiz6ku9fK3TLD/pl3CpsiFyu8N92HLgmosI=
-github.com/go-ping/ping v1.2.0 h1:vsJ8slZBZAXNCK4dPcI2PEE9eM9n9RbXbGouVQ/Y4yQ=
-github.com/go-ping/ping v1.2.0/go.mod h1:xIFjORFzTxqIV/tDVGO4eDy/bLuSyawEeojSm3GfRGk=
-github.com/gocarina/gocsv v0.0.0-20240520201108-78e41c74b4b1 h1:FWNFq4fM1wPfcK40yHE5UO3RUdSNPaBC+j3PokzA6OQ=
-github.com/gocarina/gocsv v0.0.0-20240520201108-78e41c74b4b1/go.mod h1:5YoVOkjYAQumqlV356Hj3xeYh4BdZuLE0/nRkf2NKkI=
-github.com/google/uuid v1.2.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
-github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
-github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
-github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
-github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=
-github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
-github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
-github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/fatih/color v1.7.0 h1:DkWD4oS2D8LGGgTQ6IvwJJXSL5Vp2ffcQg58nFV38Ys=
+github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
+github.com/gocarina/gocsv v0.0.0-20200302151839-87c60d755c58 h1:rRQm5os6ffGTukb42ZgKWOFfdFrocrNkLcjPYRP1tm0=
+github.com/gocarina/gocsv v0.0.0-20200302151839-87c60d755c58/go.mod h1:5YoVOkjYAQumqlV356Hj3xeYh4BdZuLE0/nRkf2NKkI=
+github.com/konsorten/go-windows-terminal-sequences v1.0.1 h1:mweAR1A6xJ3oS2pRaGiHgQ4OO8tzTaLawm8vnODuwDk=
+github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
+github.com/maddie/go-ping v0.0.0-20200305135031-f8c069280206 h1:wcRUWd5aN1arYHnxsAXx56VEV9RKQxVay24fKBv0s8M=
+github.com/maddie/go-ping v0.0.0-20200305135031-f8c069280206/go.mod h1:IYhVIzcOSIO1fLDdEz4JFidYhLPmmW3dchKuengmL9s=
+github.com/mattn/go-colorable v0.1.2 h1:/bC9yWikZXAL9uJdulbSfyVNIR3n3trXl+v8+1sx8mU=
+github.com/mattn/go-colorable v0.1.2/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
+github.com/mattn/go-isatty v0.0.8 h1:HLtExJ+uU2HOZ+wI0Tt5DtUDrx8yhUqDcp7fYERX4CE=
+github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
-github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
-github.com/sirupsen/logrus v1.9.3 h1:dueUQJ1C2q9oE3F7wvmSGAaVtTmUizReu6fjN8uqzbQ=
-github.com/sirupsen/logrus v1.9.3/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
+github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=
+github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo=
+github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
+github.com/sirupsen/logrus v1.4.2 h1:SPIRibHv4MatM3XXNO2BJeFLZwZ2LvZgfQ5+UNI2im4=
+github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
+github.com/sparrc/go-ping v0.0.0-20190613174326-4e5b6552494c h1:gqEdF4VwBu3lTKGHS9rXE9x1/pEaSwCXRLOZRF6qtlw=
+github.com/sparrc/go-ping v0.0.0-20190613174326-4e5b6552494c/go.mod h1:eMyUVp6f/5jnzM+3zahzl7q6UXLbgSc3MKg/+ow9QW0=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
-github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/urfave/cli/v2 v2.27.4 h1:o1owoI+02Eb+K107p27wEX9Bb8eqIoZCfLXloLUSWJ8=
-github.com/urfave/cli/v2 v2.27.4/go.mod h1:m4QzxcD2qpra4z7WhzEGn74WZLViBnMpb1ToCAKdGRQ=
-github.com/xrash/smetrics v0.0.0-20240521201337-686a1a2994c1 h1:gEOO8jv9F4OT7lGCjxCBTO/36wtF6j2nSip77qHd4x4=
-github.com/xrash/smetrics v0.0.0-20240521201337-686a1a2994c1/go.mod h1:Ohn+xnUBiLI6FVj/9LpzZWtj1/D6lUovWYBkxHVV3aM=
-golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4/go.mod h1:RBQZq4jEuRlivfhVLdyRGr576XBO4/greRjx4P4O3yc=
-golang.org/x/net v0.41.0 h1:vBTly1HeNPEn3wtREYfy4GZ/NECgw2Cnl+nK6Nz3uvw=
-golang.org/x/net v0.41.0/go.mod h1:B/K4NNqkfmg07DQYrbwvSluqCJOOXwUjeb/5lOisjbA=
-golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.15.0 h1:KWH3jNZsfyT6xfAfKiz6MRNmd46ByHDYaZ7KSkCtdW8=
-golang.org/x/sync v0.15.0/go.mod h1:1dzgHSNfp02xaA81J2MS99Qcpr2w7fw1gpm99rleRqA=
-golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210315160823-c6e025ad8005/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.33.0 h1:q3i8TbbEz+JRD9ywIRlyRAQbM0qF7hu24q3teo2hbuw=
-golang.org/x/sys v0.33.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
-golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/term v0.32.0 h1:DR4lr0TjUs3epypdhTOkMmuF5CDFJ/8pOnbzMZPQ7bg=
-golang.org/x/term v0.32.0/go.mod h1:uZG1FhGx848Sqfsq4/DlJr3xGGsYMu/L5GW4abiaEPQ=
-golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
+github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/urfave/cli/v2 v2.1.1 h1:Qt8FeAtxE/vfdrLmR3rxR6JRE0RoVmbXu8+6kZtYU4k=
+github.com/urfave/cli/v2 v2.1.1/go.mod h1:SE9GqnLQmjVa0iPEY0f1w3ygNIYcIJ0OKPMoW2caLfQ=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20200226121028-0de0cce0169b h1:0mm1VjtFUOIlE1SbDlwjYaDxZVDP2S5ou6y0gSgXHu8=
+golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a h1:1BGLXjeY4akVXGgbC9HugT3Jv3hCI0z56oJR5vAMgBU=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190422165155-953cdadca894 h1:Cz4ceDQGXuKRnVBDTS23GTn/pU5OE2C0WrNTOYK1Uuc=
+golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
-gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/main.go b/main.go
index cc948cc..cc93ab7 100644
--- a/main.go
+++ b/main.go
@@ -6,8 +6,8 @@ import (
 	log "github.com/sirupsen/logrus"
 	"github.com/urfave/cli/v2"
 
-	"github.com/librespeed/speedtest-cli/defs"
-	"github.com/librespeed/speedtest-cli/speedtest"
+	"librespeed-cli/defs"
+	"librespeed-cli/speedtest"
 )
 
 // init sets up the essential bits on start up
@@ -20,7 +20,6 @@ func init() {
 	// warn level is for suppress modes
 	// error level is for errors
 
-	log.SetOutput(os.Stderr)
 	log.SetFormatter(formatter)
 	log.SetLevel(log.InfoLevel)
 }
@@ -29,7 +28,7 @@ func main() {
 	// define cli options
 	app := &cli.App{
 		Name:     "librespeed-cli",
-		Usage:    "Test your Internet speed with LibreSpeed",
+		Usage:    "Test your Internet speed with LibreSpeed 🚀",
 		Action:   speedtest.SpeedTest,
 		HideHelp: true,
 		Flags: []cli.Flag{
@@ -38,16 +37,6 @@ func main() {
 				Name:  defs.OptionVersion,
 				Usage: "Show the version number and exit",
 			},
-			&cli.BoolFlag{
-				Name:    defs.OptionIPv4,
-				Aliases: []string{defs.OptionIPv4Alt},
-				Usage:   "Force IPv4 only",
-			},
-			&cli.BoolFlag{
-				Name:    defs.OptionIPv6,
-				Aliases: []string{defs.OptionIPv6Alt},
-				Usage:   "Force IPv6 only",
-			},
 			&cli.BoolFlag{
 				Name:  defs.OptionNoDownload,
 				Usage: "Do not perform download test",
@@ -56,26 +45,12 @@ func main() {
 				Name:  defs.OptionNoUpload,
 				Usage: "Do not perform upload test",
 			},
-			&cli.BoolFlag{
-				Name: defs.OptionNoICMP,
-				Usage: "Do not use ICMP ping. ICMP doesn't work well under Linux\n" +
-					"\tat this moment, so you might want to disable it",
-			},
-			&cli.IntFlag{
-				Name:  defs.OptionConcurrent,
-				Usage: "Concurrent HTTP requests being made",
-				Value: 3,
-			},
 			&cli.BoolFlag{
 				Name: defs.OptionBytes,
 				Usage: "Display values in bytes instead of bits. Does not affect\n" +
 					"\tthe image generated by --share, nor output from\n" +
 					"\t--json or --csv",
 			},
-			&cli.BoolFlag{
-				Name:  defs.OptionMebiBytes,
-				Usage: "Use 1024 bytes as 1 kilobyte instead of 1000",
-			},
 			&cli.StringFlag{
 				Name: defs.OptionDistance,
 				Usage: "Change distance unit shown in ISP info, use 'mi' for miles,\n" +
@@ -110,7 +85,7 @@ func main() {
 				Name: defs.OptionJSON,
 				Usage: "Suppress verbose output, only show basic information\n" +
 					"\tin JSON format. Speeds listed in bit/s and not\n" +
-					"\taffected by --bytes",
+					"\t affected by --bytes",
 			},
 			&cli.BoolFlag{
 				Name:  defs.OptionList,
@@ -131,52 +106,23 @@ func main() {
 				Usage: "Use an alternative server list from remote JSON file",
 			},
 			&cli.StringFlag{
-				Name: defs.OptionLocalJSON,
-				Usage: "Use an alternative server list from local JSON file,\n" +
-					"\tor read from stdin with \"--" + defs.OptionLocalJSON + " -\".",
+				Name:  defs.OptionLocalJSON,
+				Usage: "Use an alternative server list from local JSON file",
 			},
 			&cli.StringFlag{
 				Name:  defs.OptionSource,
 				Usage: "`SOURCE` IP address to bind to",
 			},
-			&cli.StringFlag{
-				Name:  defs.OptionInterface,
-				Usage: "network INTERFACE to bind to",
-			},
 			&cli.IntFlag{
 				Name:  defs.OptionTimeout,
 				Usage: "HTTP `TIMEOUT` in seconds.",
 				Value: 15,
 			},
-			&cli.IntFlag{
-				Name:  defs.OptionDuration,
-				Usage: "Upload and download test duration in seconds",
-				Value: 15,
-			},
-			&cli.IntFlag{
-				Name:  defs.OptionChunks,
-				Usage: "Chunks to download from server, chunk size depends on server configuration",
-				Value: 100,
-			},
-			&cli.IntFlag{
-				Name:  defs.OptionUploadSize,
-				Usage: "Size of payload being uploaded in KiB",
-				Value: 1024,
-			},
 			&cli.BoolFlag{
 				Name: defs.OptionSecure,
 				Usage: "Use HTTPS instead of HTTP when communicating with\n" +
 					"\tLibreSpeed.org operated servers",
 			},
-			&cli.StringFlag{
-				Name: defs.OptionCACert,
-				Usage: "Use the specified CA certificate PEM bundle file instead\n" +
-					"\tof the system certificate trust store",
-			},
-			&cli.BoolFlag{
-				Name:  defs.OptionSkipCertVerify,
-				Usage: "Skip verifying SSL certificate for HTTPS connections (self-signed certs)",
-			},
 			&cli.BoolFlag{
 				Name: defs.OptionNoPreAllocate,
 				Usage: "Do not pre allocate upload data. Pre allocation is\n" +
@@ -194,34 +140,28 @@ func main() {
 				Name: defs.OptionTelemetryJSON,
 				Usage: "Load telemetry server settings from a JSON file. This\n" +
 					"\toptions overrides --" + defs.OptionTelemetryLevel + ", --" + defs.OptionTelemetryServer + ",\n" +
-					"\t--" + defs.OptionTelemetryPath + ", and --" + defs.OptionTelemetryShare + ". Implies --" + defs.OptionShare,
+					"\t--" + defs.OptionTelemetryPath + ", and --" + defs.OptionTelemetryShare,
 			},
 			&cli.StringFlag{
 				Name: defs.OptionTelemetryLevel,
 				Usage: "Set telemetry data verbosity, available values are:\n" +
-					"\tdisabled, basic, full, debug. Implies --" + defs.OptionShare,
+					"\tdisabled, basic, full, debug",
 			},
 			&cli.StringFlag{
 				Name:  defs.OptionTelemetryServer,
-				Usage: "Set the telemetry server base URL. Implies --" + defs.OptionShare,
+				Usage: "Set the telemetry server base URL",
 			},
 			&cli.StringFlag{
 				Name:  defs.OptionTelemetryPath,
-				Usage: "Set the telemetry upload path. Implies --" + defs.OptionShare,
+				Usage: "Set the telemetry upload path",
 			},
 			&cli.StringFlag{
 				Name:  defs.OptionTelemetryShare,
-				Usage: "Set the telemetry share link path. Implies --" + defs.OptionShare,
+				Usage: "Set the telemetry share link path",
 			},
 			&cli.StringFlag{
-				Name: defs.OptionTelemetryExtra,
-				Usage: "Send a custom message along with the telemetry results.\n" +
-					"\tImplies --" + defs.OptionShare,
-			},
-			&cli.IntFlag{
-				Name:  defs.OptionFwmark,
-				Usage: "firewall mark to set on socket.",
-				Value: 0,
+				Name:  defs.OptionTelemetryExtra,
+				Usage: "Send a custom message along with the telemetry results",
 			},
 		},
 	}
diff --git a/report/json.go b/report/json.go
index d399aed..a8e7dd7 100644
--- a/report/json.go
+++ b/report/json.go
@@ -3,7 +3,7 @@ package report
 import (
 	"time"
 
-	"github.com/librespeed/speedtest-cli/defs"
+	"librespeed-cli/defs"
 )
 
 // JSONReport represents the output data fields in a JSON file
@@ -11,8 +11,8 @@ type JSONReport struct {
 	Timestamp     time.Time `json:"timestamp"`
 	Server        Server    `json:"server"`
 	Client        Client    `json:"client"`
-	BytesSent     uint64    `json:"bytes_sent"`
-	BytesReceived uint64    `json:"bytes_received"`
+	BytesSent     int       `json:"bytes_sent"`
+	BytesReceived int       `json:"bytes_received"`
 	Ping          float64   `json:"ping"`
 	Jitter        float64   `json:"jitter"`
 	Upload        float64   `json:"upload"`
diff --git a/speedtest/helper.go b/speedtest/helper.go
index 1be6203..951518b 100644
--- a/speedtest/helper.go
+++ b/speedtest/helper.go
@@ -8,17 +8,17 @@ import (
 	"math"
 	"mime/multipart"
 	"net/http"
-	"os"
 	"strconv"
 	"strings"
 	"time"
 
 	"github.com/briandowns/spinner"
 	"github.com/gocarina/gocsv"
-	"github.com/librespeed/speedtest-cli/defs"
-	"github.com/librespeed/speedtest-cli/report"
 	log "github.com/sirupsen/logrus"
-"github.com/urfave/cli/v2"
+	"github.com/urfave/cli/v2"
+
+	"librespeed-cli/defs"
+	"librespeed-cli/report"
 )
 
 const (
@@ -27,14 +27,11 @@ const (
 )
 
 // doSpeedTest is where the actual speed test happens
-func doSpeedTest(c *cli.Context, servers []defs.Server, telemetryServer defs.TelemetryServer, network string, silent bool, noICMP bool) error {
+func doSpeedTest(c *cli.Context, servers []defs.Server, telemetryServer defs.TelemetryServer, silent bool) error {
 	if serverCount := len(servers); serverCount > 1 {
 		log.Infof("Testing against %d servers", serverCount)
 	}
 
-	var reps_json []report.JSONReport
-	var reps_csv []report.CSVReport
-
 	// fetch current user's IP info
 	for _, currentServer := range servers {
 		// get telemetry level
@@ -48,10 +45,6 @@ func doSpeedTest(c *cli.Context, servers []defs.Server, telemetryServer defs.Tel
 
 		log.Infof("Selected server: %s [%s]", currentServer.Name, u.Hostname())
 
-		if sponsorMsg := currentServer.Sponsor(); sponsorMsg != "" {
-			log.Infof("Sponsored by: %s", sponsorMsg)
-		}
-
 		if currentServer.IsUp() {
 			ispInfo, err := currentServer.GetIPInfo(c.String(defs.OptionDistance))
 			if err != nil {
@@ -68,63 +61,59 @@ func doSpeedTest(c *cli.Context, servers []defs.Server, telemetryServer defs.Tel
 				pb.Start()
 			}
 
-			// skip ICMP if option given
-			currentServer.NoICMP = noICMP
-
-			p, jitter, err := currentServer.ICMPPingAndJitter(pingCount, c.String(defs.OptionSource), network)
+			p, jitter, err := currentServer.ICMPPingAndJitter(pingCount, c.String(defs.OptionSource))
 			if err != nil {
 				log.Errorf("Failed to get ping and jitter: %s", err)
 				return err
 			}
 
 			if pb != nil {
-				pb.FinalMSG = fmt.Sprintf("Ping: %.2f ms\tJitter: %.2f ms\n", p, jitter)
+				pb.FinalMSG = fmt.Sprintf("Ping: %.0f ms\tJitter: %.0f ms\n", p, jitter)
 				pb.Stop()
 			}
 
 			// get download value
 			var downloadValue float64
-			var bytesRead uint64
+			var bytesRead int
 			if c.Bool(defs.OptionNoDownload) {
 				log.Info("Download test is disabled")
 			} else {
-				download, br, err := currentServer.Download(silent, c.Bool(defs.OptionBytes), c.Bool(defs.OptionMebiBytes), c.Int(defs.OptionConcurrent), c.Int(defs.OptionChunks), time.Duration(c.Int(defs.OptionDuration))*time.Second)
+				download, br, err := currentServer.Download(silent, c.Bool(defs.OptionBytes))
 				if err != nil {
 					log.Errorf("Failed to get download speed: %s", err)
 					return err
 				}
 				downloadValue = download
-				bytesRead = uint64(br)
+				bytesRead = br
 			}
 
 			// get upload value
 			var uploadValue float64
-			var bytesWritten uint64
+			var bytesWritten int
 			if c.Bool(defs.OptionNoUpload) {
 				log.Info("Upload test is disabled")
 			} else {
-				upload, bw, err := currentServer.Upload(c.Bool(defs.OptionNoPreAllocate), silent, c.Bool(defs.OptionBytes), c.Bool(defs.OptionMebiBytes), c.Int(defs.OptionConcurrent), c.Int(defs.OptionUploadSize), time.Duration(c.Int(defs.OptionDuration))*time.Second)
+				upload, bw, err := currentServer.Upload(c.Bool(defs.OptionNoPreAllocate), silent, c.Bool(defs.OptionBytes))
 				if err != nil {
 					log.Errorf("Failed to get upload speed: %s", err)
 					return err
 				}
 				uploadValue = upload
-				bytesWritten = uint64(bw)
+				bytesWritten = bw
 			}
 
 			// print result if --simple is given
 			if c.Bool(defs.OptionSimple) {
 				if c.Bool(defs.OptionBytes) {
-					useMebi := c.Bool(defs.OptionMebiBytes)
-					log.Warnf("Ping:\t%.2f ms\tJitter:\t%.2f ms\nDownload rate:\t%s\nUpload rate:\t%s", p, jitter, humanizeMbps(downloadValue, useMebi), humanizeMbps(uploadValue, useMebi))
+					log.Warnf("Ping:\t%.0f ms\tJitter:\t%.0f ms\nDownload rate:\t%s\nUpload rate:\t%s", p, jitter, humanizeMbps(downloadValue), humanizeMbps(uploadValue))
 				} else {
-					log.Warnf("Ping:\t%.2f ms\tJitter:\t%.2f ms\nDownload rate:\t%.2f Mbps\nUpload rate:\t%.2f Mbps", p, jitter, downloadValue, uploadValue)
+					log.Warnf("Ping:\t%.0f ms\tJitter:\t%.0f ms\nDownload rate:\t%.2f Mbps\nUpload rate:\t%.2f Mbps", p, jitter, downloadValue, uploadValue)
 				}
 			}
 
 			// print share link if --share is given
 			var shareLink string
-			if telemetryServer.GetLevel() > 0 {
+			if c.Bool(defs.OptionShare) && !c.Bool(defs.OptionCSV) && telemetryServer.GetLevel() > 0 {
 				var extra defs.TelemetryExtra
 				extra.ServerName = currentServer.Name
 				extra.Extra = c.String(defs.OptionTelemetryExtra)
@@ -133,35 +122,41 @@ func doSpeedTest(c *cli.Context, servers []defs.Server, telemetryServer defs.Tel
 					log.Errorf("Error when sending telemetry data: %s", err)
 				} else {
 					shareLink = link
-					// only print to stdout when --json and --csv are not used
-					if !c.Bool(defs.OptionJSON) && !c.Bool(defs.OptionCSV) {
-						log.Warnf("Share your result: %s", link)
-					}
+					log.Warnf("Share your result: %s", link)
 				}
 			}
 
 			// check for --csv or --json. the program prioritize the --csv before the --json. this is the same behavior as speedtest-cli
 			if c.Bool(defs.OptionCSV) {
 				// print csv if --csv is given
+				var reps []report.CSVReport
+
 				var rep report.CSVReport
 				rep.Timestamp = time.Now()
 
 				rep.Name = currentServer.Name
 				rep.Address = u.String()
-				rep.Ping = math.Round(p*100) / 100
+				rep.Ping = p
 				rep.Jitter = math.Round(jitter*100) / 100
 				rep.Download = math.Round(downloadValue*100) / 100
 				rep.Upload = math.Round(uploadValue*100) / 100
 				rep.Share = shareLink
 				rep.IP = ispInfo.RawISPInfo.IP
 
-				reps_csv = append(reps_csv, rep)
+				reps = append(reps, rep)
+
+				var buf bytes.Buffer
+				if err := gocsv.MarshalWithoutHeaders(&reps, &buf); err != nil {
+					log.Errorf("Error generating CSV report: %s", err)
+				} else {
+					log.Warn(buf.String())
+				}
 			} else if c.Bool(defs.OptionJSON) {
 				// print json if --json is given
 				var rep report.JSONReport
 				rep.Timestamp = time.Now()
 
-				rep.Ping = math.Round(p*100) / 100
+				rep.Ping = p
 				rep.Jitter = math.Round(jitter*100) / 100
 				rep.Download = math.Round(downloadValue*100) / 100
 				rep.Upload = math.Round(uploadValue*100) / 100
@@ -175,34 +170,22 @@ func doSpeedTest(c *cli.Context, servers []defs.Server, telemetryServer defs.Tel
 				rep.Client = report.Client{ispInfo.RawISPInfo}
 				rep.Client.Readme = ""
 
-				reps_json = append(reps_json, rep)
+				if b, err := json.Marshal(&rep); err != nil {
+					log.Errorf("Error generating JSON report: %s", err)
+				} else {
+					log.Warnf("%s", b)
+				}
 			}
 		} else {
 			log.Infof("Selected server %s (%s) is not responding at the moment, try again later", currentServer.Name, u.Hostname())
 		}
 
-		//add a new line after each test if testing multiple servers
-		if len(servers) > 1 && !silent {
+		// add a new line after each test if testing multiple servers
+		if len(servers) > 1 {
 			log.Warn()
 		}
 	}
 
-	// check for --csv or --json. the program prioritize the --csv before the --json. this is the same behavior as speedtest-cli
-	if c.Bool(defs.OptionCSV) {
-		var buf bytes.Buffer
-		if err := gocsv.MarshalWithoutHeaders(&reps_csv, &buf); err != nil {
-			log.Errorf("Error generating CSV report: %s", err)
-		} else {
-			os.Stdout.WriteString(buf.String())
-		}
-	} else if c.Bool(defs.OptionJSON) {
-		if b, err := json.Marshal(&reps_json); err != nil {
-			log.Errorf("Error generating JSON report: %s", err)
-		} else {
-			os.Stdout.Write(b[:])
-		}
-	}
-
 	return nil
 }
 
@@ -239,7 +222,7 @@ func sendTelemetry(telemetryServer defs.TelemetryServer, ispInfo *defs.GetIPResu
 	if fPing, err := wr.CreateFormField("ping"); err != nil {
 		log.Debugf("Error creating form field: %s", err)
 		return "", err
-	} else if _, err = fPing.Write([]byte(strconv.FormatFloat(pingVal, 'f', 2, 64))); err != nil {
+	} else if _, err = fPing.Write([]byte(strconv.Itoa(int(pingVal)))); err != nil {
 		log.Debugf("Error writing form field: %s", err)
 		return "", err
 	}
@@ -247,7 +230,7 @@ func sendTelemetry(telemetryServer defs.TelemetryServer, ispInfo *defs.GetIPResu
 	if fJitter, err := wr.CreateFormField("jitter"); err != nil {
 		log.Debugf("Error creating form field: %s", err)
 		return "", err
-	} else if _, err = fJitter.Write([]byte(strconv.FormatFloat(jitter, 'f', 2, 64))); err != nil {
+	} else if _, err = fJitter.Write([]byte(strconv.Itoa(int(jitter)))); err != nil {
 		log.Debugf("Error writing form field: %s", err)
 		return "", err
 	}
@@ -316,21 +299,16 @@ func sendTelemetry(telemetryServer defs.TelemetryServer, ispInfo *defs.GetIPResu
 	}
 }
 
-func humanizeMbps(mbps float64, useMebi bool) string {
+func humanizeMbps(mbps float64) string {
 	val := mbps / 8
-	var base float64 = 1000
-	if useMebi {
-		base = 1024
-	}
-
 	if val < 1 {
-		if kb := val * base; kb < 1 {
-			return fmt.Sprintf("%.2f bytes/s", kb*base)
+		if kb := val * 1024; kb < 1 {
+			return fmt.Sprintf("%.2f bytes/s", kb*1024)
 		} else {
 			return fmt.Sprintf("%.2f KB/s", kb)
 		}
-	} else if val > base {
-		return fmt.Sprintf("%.2f GB/s", val/base)
+	} else if val > 1024 {
+		return fmt.Sprintf("%.2f GB/s", val/1024)
 	} else {
 		return fmt.Sprintf("%.2f MB/s", val)
 	}
diff --git a/speedtest/speedtest.go b/speedtest/speedtest.go
index 20018ac..a9eba6e 100644
--- a/speedtest/speedtest.go
+++ b/speedtest/speedtest.go
@@ -1,18 +1,11 @@
 package speedtest
 
 import (
-	"context"
-	"crypto/tls"
-	"crypto/x509"
 	"encoding/json"
 	"errors"
-	"fmt"
-	"io"
 	"io/ioutil"
 	"net"
 	"net/http"
-	"os"
-	"strings"
 	"sync"
 	"time"
 
@@ -20,18 +13,18 @@ import (
 	log "github.com/sirupsen/logrus"
 	"github.com/urfave/cli/v2"
 
-	"github.com/librespeed/speedtest-cli/defs"
-	"github.com/librespeed/speedtest-cli/report"
+	"librespeed-cli/defs"
+	"librespeed-cli/report"
 )
 
 const (
 	// serverListUrl is the default remote server JSON URL
-	serverListUrl = `https://librespeed.org/backend-servers/servers.php`
+	serverListUrl = `https://librespeed.org/backend-servers/servers.json`
 
 	defaultTelemetryLevel  = "basic"
 	defaultTelemetryServer = "https://librespeed.org"
 	defaultTelemetryPath   = "/results/telemetry.php"
-	defaultTelemetryShare  = "/results/"
+	defaultTeleemtryShare  = "/results/"
 )
 
 type PingJob struct {
@@ -65,7 +58,6 @@ func SpeedTest(c *cli.Context) error {
 
 	// print version
 	if c.Bool(defs.OptionVersion) {
-		log.SetOutput(os.Stdout)
 		log.Warnf("%s %s (built on %s)", defs.ProgName, defs.ProgVersion, defs.BuildDate)
 		log.Warn("https://github.com/librespeed/speedtest-cli")
 		log.Warn("Licensed under GNU Lesser General Public License v3.0")
@@ -75,10 +67,6 @@ func SpeedTest(c *cli.Context) error {
 		return nil
 	}
 
-	if c.String(defs.OptionSource) != "" && c.String(defs.OptionInterface) != "" {
-		return fmt.Errorf("incompatible options '%s' and '%s'", defs.OptionSource, defs.OptionInterface)
-	}
-
 	// set CSV delimiter
 	gocsv.TagSeparator = c.String(defs.OptionCSVDelimiter)
 
@@ -86,177 +74,104 @@ func SpeedTest(c *cli.Context) error {
 	if c.Bool(defs.OptionCSVHeader) {
 		var rep []report.CSVReport
 		b, _ := gocsv.MarshalBytes(&rep)
-		os.Stdout.WriteString(string(b))
+		log.Warnf("%s", b)
 		return nil
 	}
 
-	// read telemetry settings if --share or any --telemetry option is given
+	// read telemetry settings if --share is given
 	var telemetryServer defs.TelemetryServer
-	telemetryJSON := c.String(defs.OptionTelemetryJSON)
-	telemetryLevel := c.String(defs.OptionTelemetryLevel)
-	telemetryServerString := c.String(defs.OptionTelemetryServer)
-	telemetryPath := c.String(defs.OptionTelemetryPath)
-	telemetryShare := c.String(defs.OptionTelemetryShare)
-	if c.Bool(defs.OptionShare) || telemetryJSON != "" || telemetryLevel != "" || telemetryServerString != "" || telemetryPath != "" || telemetryShare != "" {
-		if telemetryJSON != "" {
-			b, err := ioutil.ReadFile(telemetryJSON)
+	if c.Bool(defs.OptionShare) {
+		if filename := c.String(defs.OptionTelemetryJSON); filename != "" {
+			b, err := ioutil.ReadFile(filename)
 			if err != nil {
-				log.Errorf("Cannot read %s: %s", telemetryJSON, err)
+				log.Errorf("Cannot read %s: %s", filename, err)
 				return err
 			}
 			if err := json.Unmarshal(b, &telemetryServer); err != nil {
-				log.Errorf("Error parsing %s: %s", telemetryJSON, err)
+				log.Errorf("Error parsing %s: %s", err)
 				return err
 			}
 		}
 
-		if telemetryLevel != "" {
-			if telemetryLevel != "disabled" && telemetryLevel != "basic" && telemetryLevel != "full" && telemetryLevel != "debug" {
-				log.Fatalf("Unsupported telemetry level: %s", telemetryLevel)
+		if str := c.String(defs.OptionTelemetryLevel); str != "" {
+			if str != "disabled" && str != "basic" && str != "full" && str != "debug" {
+				log.Fatalf("Unsupported telemetry level: %s", str)
 			}
-			telemetryServer.Level = telemetryLevel
+			telemetryServer.Level = str
 		} else if telemetryServer.Level == "" {
 			telemetryServer.Level = defaultTelemetryLevel
 		}
 
-		if telemetryServerString != "" {
-			telemetryServer.Server = telemetryServerString
+		if str := c.String(defs.OptionTelemetryServer); str != "" {
+			telemetryServer.Server = str
 		} else if telemetryServer.Server == "" {
 			telemetryServer.Server = defaultTelemetryServer
 		}
 
-		if telemetryPath != "" {
-			telemetryServer.Path = telemetryPath
+		if str := c.String(defs.OptionTelemetryPath); str != "" {
+			telemetryServer.Path = str
 		} else if telemetryServer.Path == "" {
 			telemetryServer.Path = defaultTelemetryPath
 		}
 
-		if telemetryShare != "" {
-			telemetryServer.Share = telemetryShare
+		if str := c.String(defs.OptionTelemetryShare); str != "" {
+			telemetryServer.Share = str
 		} else if telemetryServer.Share == "" {
-			telemetryServer.Share = defaultTelemetryShare
+			telemetryServer.Share = defaultTeleemtryShare
 		}
 	}
 
-	if req := c.Int(defs.OptionConcurrent); req <= 0 {
-		log.Errorf("Concurrent requests cannot be lower than 1: %d is given", req)
-		return errors.New("invalid concurrent requests setting")
-	}
-
-	noICMP := c.Bool(defs.OptionNoICMP)
-
 	// HTTP requests timeout
 	http.DefaultClient.Timeout = time.Duration(c.Int(defs.OptionTimeout)) * time.Second
 
-	forceIPv4 := c.Bool(defs.OptionIPv4)
-	forceIPv6 := c.Bool(defs.OptionIPv6)
-
-	var network string
-	switch {
-	case forceIPv4:
-		network = "ip4"
-	case forceIPv6:
-		network = "ip6"
-	default:
-		network = "ip"
-	}
-
-	transport := http.DefaultTransport.(*http.Transport).Clone()
-
-	if caCertFileName := c.String(defs.OptionCACert); caCertFileName != "" {
-		caCert, err := ioutil.ReadFile(caCertFileName)
-		if err != nil {
-			log.Fatal(err)
-		}
-		caCertPool := x509.NewCertPool()
-		caCertPool.AppendCertsFromPEM(caCert)
-
-		transport.TLSClientConfig = &tls.Config{
-			InsecureSkipVerify: c.Bool(defs.OptionSkipCertVerify),
-			RootCAs:            caCertPool,
-		}
-	} else {
-		transport.TLSClientConfig = &tls.Config{
-			InsecureSkipVerify: c.Bool(defs.OptionSkipCertVerify),
-		}
-	}
-
-	dialer := &net.Dialer{
-		Timeout:   30 * time.Second,
-		KeepAlive: 30 * time.Second,
-	}
 	// bind to source IP address if given
 	if src := c.String(defs.OptionSource); src != "" {
-		var err error
-		dialer, err = newDialerAddressBound(src, network)
+		// first we parse the IP to see if it's valid
+		localAddr, err := net.ResolveIPAddr("ip", src)
 		if err != nil {
+			log.Errorf("Error parsing source IP: %s", err)
 			return err
 		}
-	}
 
-	// bind to interface if given
-	// bind to interface if given
-	iface := c.String(defs.OptionInterface)
-	fwmark := c.Int(defs.OptionFwmark)
+		localTCPAddr := net.TCPAddr{IP: localAddr.IP}
 
-	if iface != "" || fwmark > 0 {
-		var err error
-		dialer, err = newDialerInterfaceOrFwmarkBound(iface, fwmark)
-		if err != nil {
-			return err
+		// set default HTTP client's Transport to the one that binds the source address
+		// this is modified from http.DefaultTransport
+		transport := &http.Transport{
+			Proxy: http.ProxyFromEnvironment,
+			DialContext: (&net.Dialer{
+				LocalAddr: &localTCPAddr,
+				Timeout:   30 * time.Second,
+				KeepAlive: 30 * time.Second,
+				// although this option is marked deprecated, but it's still used in http.DefaultTransport, keeping as-is
+				DualStack: true,
+			}).DialContext,
+			ForceAttemptHTTP2:     true,
+			MaxIdleConns:          100,
+			IdleConnTimeout:       90 * time.Second,
+			TLSHandshakeTimeout:   10 * time.Second,
+			ExpectContinueTimeout: 1 * time.Second,
 		}
-		// ICMP ping does not support interface binding.
-		noICMP = true
-	}
 
-	// enforce if ipv4/ipv6 is forced
-	var dialContext func(context.Context, string, string) (net.Conn, error)
-	switch {
-	case forceIPv4:
-		dialContext = func(ctx context.Context, network, address string) (conn net.Conn, err error) {
-			return dialer.DialContext(ctx, "tcp4", address)
-		}
-	case forceIPv6:
-		dialContext = func(ctx context.Context, network, address string) (conn net.Conn, err error) {
-			return dialer.DialContext(ctx, "tcp6", address)
-		}
-	default:
-		dialContext = dialer.DialContext
+		http.DefaultClient.Transport = transport
 	}
 
-	// set default HTTP client's Transport to the one that binds the source address
-	// this is modified from http.DefaultTransport
-	transport.DialContext = dialContext
-	http.DefaultClient.Transport = transport
-
 	// load server list
 	var servers []defs.Server
 	var err error
 	if str := c.String(defs.OptionLocalJSON); str != "" {
-		switch str {
-		case "-":
-			// load server list from stdin
-			log.Info("Using local JSON server list from stdin")
-			servers, err = getLocalServersReader(c.Bool(defs.OptionSecure), os.Stdin, c.IntSlice(defs.OptionExclude), c.IntSlice(defs.OptionServer), !c.Bool(defs.OptionList))
-		default:
-			// load server list from local JSON file
-			log.Infof("Using local JSON server list: %s", str)
-			servers, err = getLocalServers(c.Bool(defs.OptionSecure), str, c.IntSlice(defs.OptionExclude), c.IntSlice(defs.OptionServer), !c.Bool(defs.OptionList))
-		}
+		// load server list from local JSON file
+		log.Infof("Using local JSON server list: %s", str)
+		servers, err = getLocalServers(c.Bool(defs.OptionSecure), str, c.IntSlice(defs.OptionExclude), c.IntSlice(defs.OptionServer), !c.Bool(defs.OptionList))
 	} else {
 		// fetch the server list JSON and parse it into the `servers` array
+		log.Info("Retrieving LibreSpeed.org server list")
 		serverUrl := serverListUrl
 		if str := c.String(defs.OptionServerJSON); str != "" {
 			serverUrl = str
 		}
-		log.Infof("Retrieving server list from %s", serverUrl)
 
 		servers, err = getServerList(c.Bool(defs.OptionSecure), serverUrl, c.IntSlice(defs.OptionExclude), c.IntSlice(defs.OptionServer), !c.Bool(defs.OptionList))
-
-		if err != nil {
-			log.Info("Retry with /.well-known/librespeed")
-			servers, err = getServerList(c.Bool(defs.OptionSecure), serverUrl+"/.well-known/librespeed", c.IntSlice(defs.OptionExclude), c.IntSlice(defs.OptionServer), !c.Bool(defs.OptionList))
-		}
 	}
 	if err != nil {
 		log.Errorf("Error when fetching server list: %s", err)
@@ -265,33 +180,29 @@ func SpeedTest(c *cli.Context) error {
 
 	// if --list is given, list all the servers fetched and exit
 	if c.Bool(defs.OptionList) {
-		for _, svr := range servers {
-			var sponsorMsg string
-			if svr.Sponsor() != "" {
-				sponsorMsg = fmt.Sprintf(" [Sponsor: %s]", svr.Sponsor())
-			}
-			log.Warnf("%d: %s (%s) %s", svr.ID, svr.Name, svr.Server, sponsorMsg)
+		for idx, svr := range servers {
+			log.Warnf("%d: %s (%s)", idx, svr.Name, svr.Server)
 		}
 		return nil
 	}
 
 	// if --server is given, do speed tests with all of them
 	if len(c.IntSlice(defs.OptionServer)) > 0 {
-		return doSpeedTest(c, servers, telemetryServer, network, silent, noICMP)
+		return doSpeedTest(c, servers, telemetryServer, silent)
 	} else {
 		// else select the fastest server from the list
 		log.Info("Selecting the fastest server based on ping")
 
 		var wg sync.WaitGroup
-		jobs := make(chan PingJob, len(servers))
-		results := make(chan PingResult, len(servers))
+		jobs := make(chan PingJob, 10)
+		results := make(chan PingResult, 10)
 		done := make(chan struct{})
 
 		pingList := make(map[int]float64)
 
 		// spawn 10 concurrent pingers
 		for i := 0; i < 10; i++ {
-			go pingWorker(jobs, results, &wg, c.String(defs.OptionSource), network, noICMP)
+			go pingWorker(jobs, results, &wg, c.String(defs.OptionSource))
 		}
 
 		// send ping jobs to workers
@@ -328,11 +239,11 @@ func SpeedTest(c *cli.Context) error {
 		}
 
 		// do speed test on the server
-		return doSpeedTest(c, []defs.Server{servers[serverIdx]}, telemetryServer, network, silent, noICMP)
+		return doSpeedTest(c, []defs.Server{servers[serverIdx]}, telemetryServer, silent)
 	}
 }
 
-func pingWorker(jobs <-chan PingJob, results chan<- PingResult, wg *sync.WaitGroup, srcIp, network string, noICMP bool) {
+func pingWorker(jobs <-chan PingJob, results chan<- PingResult, wg *sync.WaitGroup, srcIp string) {
 	for {
 		job := <-jobs
 		server := job.Server
@@ -346,11 +257,8 @@ func pingWorker(jobs <-chan PingJob, results chan<- PingResult, wg *sync.WaitGro
 
 		// check the server is up by accessing the ping URL and checking its returned value == empty and status code == 200
 		if server.IsUp() {
-			// skip ICMP if option given
-			server.NoICMP = noICMP
-
 			// if server is up, get ping
-			ping, _, err := server.ICMPPingAndJitter(1, srcIp, network)
+			ping, _, err := server.ICMPPingAndJitter(1, srcIp)
 			if err != nil {
 				log.Debugf("Can't ping server %s (%s), skipping", server.Name, u.Hostname())
 				wg.Done()
@@ -375,13 +283,7 @@ func getServerList(forceHTTPS bool, serverList string, excludes, specific []int,
 
 	// getting the server list from remote
 	var servers []defs.Server
-	req, err := http.NewRequest(http.MethodGet, serverList, nil)
-	if err != nil {
-		return nil, err
-	}
-	req.Header.Set("User-Agent", defs.UserAgent)
-
-	resp, err := http.DefaultClient.Do(req)
+	resp, err := http.DefaultClient.Get(serverList)
 	if err != nil {
 		return nil, err
 	}
@@ -399,13 +301,10 @@ func getServerList(forceHTTPS bool, serverList string, excludes, specific []int,
 	return preprocessServers(servers, forceHTTPS, excludes, specific, filter)
 }
 
-// getLocalServersReader loads the server JSON from an io.Reader
-func getLocalServersReader(forceHTTPS bool, reader io.ReadCloser, excludes, specific []int, filter bool) ([]defs.Server, error) {
-	defer reader.Close()
-
+// getLocalServers loads the server JSON from a local file
+func getLocalServers(forceHTTPS bool, jsonFile string, excludes, specific []int, filter bool) ([]defs.Server, error) {
 	var servers []defs.Server
-
-	b, err := ioutil.ReadAll(reader)
+	b, err := ioutil.ReadFile(jsonFile)
 	if err != nil {
 		return nil, err
 	}
@@ -417,15 +316,6 @@ func getLocalServersReader(forceHTTPS bool, reader io.ReadCloser, excludes, spec
 	return preprocessServers(servers, forceHTTPS, excludes, specific, filter)
 }
 
-// getLocalServers loads the server JSON from a local file
-func getLocalServers(forceHTTPS bool, jsonFile string, excludes, specific []int, filter bool) ([]defs.Server, error) {
-	f, err := os.OpenFile(jsonFile, os.O_RDONLY, 0644)
-	if err != nil {
-		return nil, err
-	}
-	return getLocalServersReader(forceHTTPS, f, excludes, specific, filter)
-}
-
 // preprocessServers makes some needed modifications to the servers fetched
 func preprocessServers(servers []defs.Server, forceHTTPS bool, excludes, specific []int, filter bool) ([]defs.Server, error) {
 	for i := range servers {
@@ -455,8 +345,8 @@ func preprocessServers(servers []defs.Server, forceHTTPS bool, excludes, specifi
 		// exclude servers from --exclude
 		if len(excludes) > 0 {
 			var ret []defs.Server
-			for _, server := range servers {
-				if contains(excludes, server.ID) {
+			for idx, server := range servers {
+				if contains(excludes, idx) {
 					continue
 				}
 				ret = append(ret, server)
@@ -468,15 +358,11 @@ func preprocessServers(servers []defs.Server, forceHTTPS bool, excludes, specifi
 		// special value -1 will test all servers
 		if len(specific) > 0 && !contains(specific, -1) {
 			var ret []defs.Server
-			for _, server := range servers {
-				if contains(specific, server.ID) {
+			for idx, server := range servers {
+				if contains(specific, idx) {
 					ret = append(ret, server)
 				}
 			}
-			if len(ret) == 0 {
-				error_message := fmt.Sprintf("specified server(s) not found: %v", specific)
-				return nil, errors.New(error_message)
-			}
 			return ret, nil
 		}
 	}
@@ -493,31 +379,3 @@ func contains(arr []int, val int) bool {
 	}
 	return false
 }
-
-func newDialerAddressBound(src string, network string) (dialer *net.Dialer, err error) {
-	// first we parse the IP to see if it's valid
-	addr, err := net.ResolveIPAddr(network, src)
-	if err != nil {
-		if strings.Contains(err.Error(), "no suitable address") {
-			if network == "ip6" {
-				log.Errorf("Address %s is not a valid IPv6 address", src)
-			} else {
-				log.Errorf("Address %s is not a valid IPv4 address", src)
-			}
-		} else {
-			log.Errorf("Error parsing source IP: %s", err)
-		}
-		return nil, err
-	}
-
-	log.Debugf("Using %s as source IP", src)
-	localTCPAddr := &net.TCPAddr{IP: addr.IP}
-
-	defaultDialer := &net.Dialer{
-		Timeout:   30 * time.Second,
-		KeepAlive: 30 * time.Second,
-	}
-
-	defaultDialer.LocalAddr = localTCPAddr
-	return defaultDialer, nil
-}
diff --git a/speedtest/util.go b/speedtest/util.go
deleted file mode 100644
index 0a35393..0000000
--- a/speedtest/util.go
+++ /dev/null
@@ -1,13 +0,0 @@
-//go:build !linux
-// +build !linux
-
-package speedtest
-
-import (
-	"fmt"
-	"net"
-)
-
-func newDialerInterfaceOrFwmarkBound(iface string, fwmark int) (dialer *net.Dialer, err error) {
-	return nil, fmt.Errorf("cannot bound to interface on this platform")
-}
diff --git a/speedtest/util_linux.go b/speedtest/util_linux.go
deleted file mode 100644
index e153e87..0000000
--- a/speedtest/util_linux.go
+++ /dev/null
@@ -1,38 +0,0 @@
-package speedtest
-
-import (
-	"net"
-	"syscall"
-	"time"
-
-	"golang.org/x/sys/unix"
-)
-
-func newDialerInterfaceOrFwmarkBound(iface string, fwmark int) (dialer *net.Dialer, err error) {
-	// In linux there is the socket option SO_BINDTODEVICE.
-	// Therefore we can really bind the socket to the device instead of binding to the address that
-	// would be affected by the default routes.
-	control := func(network, address string, c syscall.RawConn) error {
-		var errSock error
-		err := c.Control((func(fd uintptr) {
-			if iface != "" {
-				errSock = unix.BindToDevice(int(fd), iface)
-			}
-
-			if fwmark > 0 {
-				errSock = syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, fwmark)
-			}
-		}))
-		if err != nil {
-			return err
-		}
-		return errSock
-	}
-
-	dialer = &net.Dialer{
-		Timeout:   30 * time.Second,
-		KeepAlive: 30 * time.Second,
-		Control:   control,
-	}
-	return dialer, nil
-}
diff --git a/upx.sh b/upx.sh
deleted file mode 100755
index 22b4320..0000000
--- a/upx.sh
+++ /dev/null
@@ -1,2 +0,0 @@
-#!/bin/sh
-upx "$@" || true
\ No newline at end of file