You probably never see what reddit like after it just get rewrite. https://www.reddit.com/r/bugs/comments/rj0u77/reddit_redesig...

I won't say most react apps performs like this. But it's what you will get if you ship a big react app without optimization at all.

Other framework mostly have a much saner default (for example, component without argument change does not re-render). So it will work well (not best though) even in large scale. But in react they are all opt-in.