Yeah, also we have a lot of code that a lot of engineers in our company run. Some of it takes hours instead of a few minutes to run, because it's a bunch of slo

Yeah, also we have a lot of code that a lot of engineers in our company run. Some of it takes hours instead of a few minutes to run, because it's a bunch of slowness combined. Sure you can say the engineer doesn't have to watch. But sometimes you need this result, and can't do much else until it's there. Doing a few loops at a few hours at a time is very time consuming. Being lazy about slowness is bad in the long run, if you or your customers waste inordinate amounts of time, because one of your devs didn't want to think. Sure you should optimize from the bottleneck, look at hot path, measure where optimization makes sense. But using tools that make some stuff 10x faster without much effort is not premature optimization. It's just not being stupid.