React is far from performant for SSR, and it simply can’t be, as it wasn’t designed with backend needs in mind. The fact that it works at all is more of a happy accident or side effect. Current approaches are more like workarounds than proper solutions for making it function effectively on servers.

Most importantly, it’s also not particularly performant on the client side in real-world scenarios.

For evidence, here’s a guy testing major websites using his awesome react-scan tool: https://x.com/aidenybai/status/1861442057598062653