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 would;dn't be because speed doesn't matter.