But perfect performance isn't even the benchmark, it's "not ridiculously slow". This is what is meant by "Computers are fast, but you don't know it", you don't even know how ludicrously fast computers are because so much stuff is so insanely slow.

They're so fast that, in the vast majority of cases, you don't even need optimization, you just need non-pessimization: https://youtu.be/pgoetgxecw8