Performance has always been a pet peeve of mine.
It took some years, but I've finally beaten the "It must be X!" out of my system when I run into a perf issue. I've gotten disciplined enough to test a system, even if it means building a throwaway mockup simulation(ie github.com/richardhendricks/GT-sta...), to determine where the real performance problems are located and attack those instead of what other people or my gut tells me. I don't know if stories about improving performance on ancient Minecraft mods would be interesting to anyone, but maybe I'll write up the couple times I've done it.
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