[wolco2]

Code quality has little to do with performance.

Code quality here is more messy code, code that work now but doesn't abstract, ugly variables names like x..

Things that may even make your performance better now but harder/impossible to scale later.

[BobbyJo]

In my experience code quality has a LOT to do with performance. Code changes over time, and bad code generally requires a lot more compromises when those changes happen.