> A perf improvement that takes something from hundreds of minutes down to 1.2s does make the person who did the original implementation look bad. Yes, it does

> A perf improvement that takes something from hundreds of minutes down to 1.2s does make the person who did the original implementation look bad. Yes, it does. An adult in this situation says "dude, did I write a shitty code! Thanks for fixing it, good job!" A manipulator starts to refer to the code "the code I initiated with X's improvements" or just "our code". An idiot starts screaming so everybody remembers about his failure and tells about it to strangers years after. It's hard to be an idiot.