Today was a good day. Put up a code review for the biggest perf optimization I've ever written :D (at least in terms of ms saved)
In the end wasn't anything fancy, just object-oriented -> data-oriented change, cache efficiency is bonkers, go figure.
Better engineers would've gotten it right the first time, but I appreciated the OO up to this point for carrying me along until I knew what I actually needed to do with the data.