react-component-performance

Topics in the source

• React Component Performance
• Overview
• When to Use
• Workflow
• Checklist
• Optimization Patterns
• Isolate ticking state
• Stabilize callbacks with useCallback + memo

Identify render hotspots, isolate expensive updates, and apply targeted optimizations without changing UI behavior. When the user asks to profile or improve a slow React component. When you need to reduce re-renders, list lag, or expensive render work in React UI. 1. Reproduce or describe the slowdown. 2. Identify what triggers re-renders (state updates, props churn, effects). 3. Isolate fast-changing state from heavy subtrees. 4. Stabilize props and handlers; memoize where it pays off. 5. Reduce expensive work (computation, DOM size, list length). 6. Validate: open React DevTools Profiler → record the interaction → inspect the Flamegraph for components rendering longer than 16 ms → compare against a pre-optimization baseline recording. Measure: use React DevTools Profiler or log renders; capture baseline. Find churn: identify state updated on a timer, scroll, input, or animation. Split: move ticking state into a child; keep heavy lists static. Memoize: wrap leaf rows with memo only when props are stable. Stabilize props: use useCallback/useMemo for handlers and derived values. Avoid derived work in render: precompute, or compute inside memoized helpers. Control list size: window/v

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