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My nephew recommended optimizing React application rendering using useMemo, but is that actually better than just refactoring components in modern React?

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My nephew recommended optimizing React application rendering using useMemo, but is that actually better than just refactoring components in modern React?
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React official docs useMemo React Compiler automatic memoization when to use useMemoGoogle ↗
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React official docs useMemo React Compiler automatic memoization when to use useMemo Google ↗
  1. Introduction · react.dev
  2. React Compiler · react.dev

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React official docs useMemo React Compiler automatic memoization when to use useMemo
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