I just see too many programmers that right from the start try to micro-optimize their code with things like this. You'll usually see very well written code but

I just see too many programmers that right from the start try to micro-optimize their code with things like this. You'll usually see very well written code but with all sorts of hacks, taken from blogs and StackOverflow answers and whatnot all across the web, but in the end they fail to optimize their actual algorithm and end up with some ultra-high memory footprints or O(n^3) stuff instead of some nice O(log(n)) for example. And they'll argue that they already "optimized the sh*t out of it", because they saved a couple of hundred assembly calls in a binary file around the size of a few megabytes ...