Why are my React components re-rendering so much?
Components re-render when their state changes, when their parent re-renders, or when their props change. If you pass new object or function references as props on every render, children re-render unnecessarily. Understanding this flow is essential for fixing performance issues.
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More FAQs in Common Mistakes Beginners Make When Starting With React
React tracks state changes through the setter function returned by useState. When you mutate state directly, React may not detect the change and will skip re-rendering, leaving your UI out of sync. Always use the setter to update state.
It works for static lists that never change, but it causes bugs when items are added, removed, or reordered because the index no longer maps to the same item. Use a stable unique id from your data whenever possible.
Infinite loops usually happen when you call a state setter inside useEffect without a correct dependency array, or when you include a value that changes on every render. Make sure your dependency array lists only the values the effect actually depends on.
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