Historically, devs never optimized their code. Very, very few devs even cared about it beyond the "tuning the use of my libraries" thinking. The AI slop of today is more optimized than most devs ever dream to be.

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I like to imagine that forced constraints caused humanity to be more efficient, which led to the abundant, & prosperous times that we live in. (When measured in the price of hard money, fiat money is fiat, need I say more)
The average dev is too much of an idiot to do well in constraint environments. All they did was to not bother with animations, transparency and rounded corners and then boom, everything is fast.