go performs badly on windows (gc)

go_cpu_bound.go

package main

func main(){
	buf := make([]byte, 10000)
	length := len(buf)
	for i:=0; i<100000; i++ {
		for j:=0; j<100000; j++ {
			buf[(i+j)%length] = buf[j%length]
		}
	}
}