Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

go version go1.8.3 linux/amd64

What operating system and processor architecture are you using (go env)?

linux, amd64

What did you do?

A simple for loop,

 package main

 import "fmt"

 func main(){
     for i := 0; i < 1000000; i++ {
         fmt.Println(i)
     }
}

What did you expect to see?

time taken to be around, 1 or 2 seconds

What did you see instead?

time taken is 6 seconds.

I have written the same in python,

for i in range(1,1000000)
    print(i)

time taken for python is around 2.3 seconds.
Since, printing to screen takes time, I have redirected output to files, in both programs.

Another point is, go.txt file is 2 bytes more in size compared to py.txt

Here's the screen shot,