Answer
Reasons include parent re-renders, non-stable prop references, context changes, or Strict Mode development re-renders.
Quick Answer
React.memo does a shallow comparison of props. If a parent passes a new object or function reference on each render (even with identical content), the memoized child still re-renders. Memoization only works when props are referentially stable — stabilize callbacks with useCallback and objects with useMemo.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ