This is covered in the article, and he even does a benchmark of 25k iterations, and then explains why go is slower, creates a more apples to apples comparison w

This is covered in the article, and he even does a benchmark of 25k iterations, and then explains why go is slower, creates a more apples to apples comparison where go is only slightly slower, and then optimizes the syscalls to create a go program many times faster than the asm.