You're assuming they didn't try that. I wrote a blog post about a benchmark once, and posted on Reddit/HN, and everyone was like "clearly he should've tried X a

You're assuming they didn't try that. I wrote a blog post about a benchmark once, and posted on Reddit/HN, and everyone was like "clearly he should've tried X and Y" which I had, but didn't mention because I had mentioned many other things already which I thought were more interesting to mention... So, my advice is: try it before you accuse someone of not having done it properly. I can almost guarantee you'll find it's not better. If you find it's better, then at least you don't make a fool of yourself by suggesting inocuous changes. Performance is very surprising sometimes.