I was profiling my code in the early nineties. Sure, I created primitive profiling tools on my own, but regardless. While 486 AGI stalls were trivial, especial

I was profiling my code in the early nineties. Sure, I created primitive profiling tools on my own, but regardless. While 486 AGI stalls were trivial, especially Pentium changed the game with its U and V pipes. You could no longer trivially eyeball what code is faster. Profiling was a must. Heck, I even "profiled" my C64 routines in the eighties by changing the border color. You could clearly visually see how long your code takes to execute.