low bandwith usage on golang exec.Command("").Run()

Question

I am building a golang app which uses youtube-dl to download some files from mixcloud. I recognized that when I execute youtube-dl https://www.mixcloud.com/FatboySlim/ in my terminal I receive download speeds with an average of 10 MiB/s.

When I execute the same command in golang I only receive download speeds with an average of 2 MiB/s.

Is there any reason why it is so slow? Any idea how to fix it?

Reproduce as follows:

In Bash/Shell

bash youtube-dl https://www.mixcloud.com/FatboySlim/

package main

import (
    "log"
    "os"
    "os/exec"
)

func main() {
    cmd := exec.Command("youtube-dl", "https://www.mixcloud.com/FatboySlim/")
    cmd.Stdout = os.Stdout
    cmd.Stderr = os.Stderr
    err := cmd.Run()
    if err != nil {
        log.Fatal(err)
    }
}