Comment by Rapzid

This is where my mind keeps coming back too. I keep hearing "it doesn't matter" and yet nearly every compiler I come into contact with is an optimizing compiler. Heck, even with some pretty straight up "performant" code that difference between optimizations on and off in a lot of these can be significant.

C#,C++,C,Go,V8

Just about everything.. I can only imagine what would happen if every process on all the systems I deal with were re-compiled with optimizations off :|