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What is memoization in React Native?

Updated May 6, 2026

Short answer

Memoization is an optimization technique to cache results of expensive operations.

Deep explanation

React Native uses memoization via React.memo, useMemo, and useCallback to prevent unnecessary re-renders and recalculations. It improves performance in complex UI trees.

Real-world example

Preventing re-render of list items in FlatList.

Common mistakes

  • Over-memoizing everything without profiling.

Follow-up questions

  • What is React.memo?
  • Does memoization always improve performance?

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