Measure Component Render Costs with <Profiler>
React's `<Profiler>` is a stopwatch for your components, measuring render times programmatically. Wrap any UI tree to log detailed performance metrics on every update, helping you pinpoint slow renders. The footgun: It's disabled in production by default.
React's `<Profiler>` is a built-in stopwatch that programmatically measures the render cost of a component tree. By wrapping a UI section, its `onRender` callback fires on every update, providing timings like `actualDuration` and `baseDuration`. This is ideal for logging performance metrics to an analytics service to track trends. The footgun: Profiling adds overhead and is disabled in production by default; you must use a special build to enable it, otherwise your callback won't fire.
Read the original → react.dev
- #react
- #performance
- #profiling
- #frontend
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