[SuperV1234]

> Is it because I made hundreds decisions like that? Yes.

Proof needed. Perhaps your overall program is designed to be fast and avoid silly bottlenecks, and these "hundred decisions" didn't really matter at all.

[fsloth]

In my experience performance comes from constant vigilance and using every opportunity to choose the performant way of implementing something.

Silly bottlenecks are half of the perf story in my experience. The other half are a billion tiny details.

[SuperV1234]

But do you have actual proof for your first claim? Isn't it possible that the "constant vigilance" is optimizing that ~10% that doesn't really matter in the end?