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> So while its true that a state update will rebuild an entire component

What if the component does some long computations, for example, calculating a sum of 10000 elements of an array? React will do the computation only to find that nothing changed.

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Put that computation in a useMemo and you're good.

This example just sounds like it was coded poorly. I would assume that experienced React developers would know to avoid something like this.

For inexperienced developers, you don’t need a framework to do something dumb.

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