>React performance concerns in the real world are typically measured in, at worst, hundreds of milliseconds. Yes, there are a few specialized domains where this will matter. No, you probably don’t work in one. Greater leverage can almost always be derived from improving the backend.
Other commenters have elaborated as well, but to summmarize: hundreds of Ms on a dev machine a) does matter and b) is likely much much more in less than ideal computing environments, I disagree that the backend usually is where more time is spent (at least in maaaaany apps I have worked on) And re: specialized domains, I think most users of most software appreciate speed even if it isn’t a stated objective
Respectfully, I disagree on all of these points.