Comment by mike_hearn

The React paradigm is just error prone. It's not necessarily about how much you spend. Well paid engineers can still make mistakes that cause unnecesssary re-renders.

If you look at older desktop GUI frameworks designed in a performance-oriented era, none of them use the React paradigm, they use property binding. A good example of getting this right is JavaFX which lets you build up functional pipelines that map data to UI but in a way that ensures only what's genuinely changed gets recomputed. Dependencies between properties are tracked explicitly. It's very hard to put the UI into a loop.