Maybe I worded that incorrectly - yes performance is important. But the negligible gains between framework x and framework y are not high on my evaluation checklist, as long as the minimum performance requirement is met (which is often dictated by the product requirements).

I've been working in React for ~4 years now, at all types of scale. While I've definitely seen performance issues, it's never been a case of a flaw in the approach the React takes.

I guess a better way to phrase my point - until I encounter a scenario where the performance is bad enough in React to warrant looking at other frameworks, choosing a framework based on pure performance is an over-optimization.

Of course, this would be a different conversation if React was known for being the one and only bottleneck in web app performance - but afaik that is a rare case.