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nicko
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Beginner
Asked: 2025-02-20T01:49:02+00:00 In:

How do you optimize React apps for performance?

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An explanation of performance optimization in React.

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1 Answer

  1. Timmy Dilk

    You can optimize React apps for performance by:

    Using React.memo: Prevents unnecessary re-renders of functional components.
    Code-splitting: Load only the necessary code using dynamic import() and tools like React.lazy.
    useCallback & useMemo: Memoize functions and values to avoid recalculating on every render.
    Virtualization: Render only visible items in long lists using libraries like react-window.
    Avoid Anonymous Functions in JSX: Declare functions outside JSX to prevent re-creation on every render.
    Efficient State Management: Keep state local when possible and avoid deep nested state objects.

    Measuring Performance:
    Use React DevTools Profiler to analyze component re-renders and identify bottlenecks.

  2. Timmy Dilk

    You can optimize React apps for performance by:

    1. Using React.memo: Prevents unnecessary re-renders of functional components.
    2. Code-splitting: Load only the necessary code using dynamic import() and tools like React.lazy.
    3. useCallback & useMemo: Memoize functions and values to avoid recalculating on every render.
    4. Virtualization: Render only visible items in long lists using libraries like react-window.
    5. Avoid Anonymous Functions in JSX: Declare functions outside JSX to prevent re-creation on every render.
    6. Efficient State Management: Keep state local when possible and avoid deep nested state objects.

    Measuring Performance:
    Use React DevTools Profiler to analyze component re-renders and identify bottlenecks.