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Comment on Speedup from switch to +=

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Whenever I see things like this in highly visible code that people exclaim about across the internet it makes me really take a moment to absorb how much time I spend agonizing over minutae in my daily work and how people who really are just lucky can get away with much worse. Just a reminder about how the idea that "tech" is a meritocracy was never really true.

I assume that you don't have thousands of people looking over your code, how can you know that it doesn't have similar or greater room for optimization?

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