I thought this article was pretty interesting.
It's very often that I'll be working on a project and focusing on behavior issues when someone will come along and tell me it's not optimized fully. They're right in a sense, but I don't really care generally and certainly don't care while I'm trying to get the behavior right. It's not as if the code I'm writing is wildly unoptimized... it's just a bit unoptimized.
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