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>Write slow code now, profile and optimize later is how we got all slow software because second step

We got slow software because we were ok to get slow software. If being fast is not in requirements it means it doesn't matter (for whoever is responsible for defining priorities). Places where performance matters it is never sacrificed.

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Doesn't matter for what/who? It's doesn't matter from the business angle since there isn't any competition that works better. But it definitely matters for me.

I am not okay with slow software, and being forced to use it is frankly insulting. Teams (to pick a punching bag) hogging my system resources doesn't impact its adoption since I'm forced to use it. Teams could be 10x slower and I'd probably still be forced to use it. But it wouldn't be because speed doesn't matter.

This is a fully general counterargument for why anything that is bad is actually good because it doesn't matter. "Places where air quality matters it is never sacrificed".

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