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React Compiler automatically memoizes eligible components and hooks during the build, so developers can often avoid adding memoization by hand. It is a stable build-time tool—not a runtime switch or a promise that every app will become faster. Its value depends on your code following the Rules of React and on whether repeated work is actually a performance problem.
What does React Compiler do?
The React team describes React Compiler as “a build-time tool that optimizes your React app through automatic memoization.” It analyzes code—including data flow and mutability—and transforms eligible components and hooks so React can reuse values or avoid unnecessary work. Unlike manually placing useMemo, useCallback or React.memo throughout a codebase, the compiler can reason about finer-grained dependencies and conditional execution.
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“Magic” is shorthand for that static analysis and transformation. The compiler runs as part of your build pipeline; it does not continually optimize code at runtime. It also checks for patterns that conflict with the Rules of React. Components or hooks that cannot be safely compiled may be skipped, while other eligible code can still be optimized. The React team announced the stable 1.0 release on October 7, 2025.
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It can reduce avoidable repeated work, but the effect varies with the application, code patterns, user interactions and workload. The React team reported that the Meta Quest Store saw up to 12% improvement in initial loads and cross-page navigation, and that certain interactions were more than 2.5× faster. Those are results from one named deployment, not a general benchmark or a forecast for every React app.
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Before adding complicated performance machinery—or judging the compiler—profile the work that matters in your app. If a component is not a meaningful bottleneck, memoizing it may not produce a noticeable user benefit.
Should you try out the compiler?
For most teams on a supported React version, trying it in a controlled rollout is reasonable. The React team says it works without component rewrites when code follows the Rules of React. You do not have to fix every compiler diagnostic before starting: a component or hook with an issue can be skipped without blocking optimization elsewhere.
Check your React version and runtime
| React version | Compiler runtime | Target configuration |
|---|---|---|
| React 19 | Built-in compiler runtime APIs | Default target; no separate runtime package required |
| React 17 or 18 | Install react-compiler-runtime |
Set the compiler target to the matching major version, such as '18', not a patch version |
The compiler is designed to work best with React 19; React 17 and 18 are supported with the separate runtime and matching target. Follow the current installation guide for package and framework details.
Install it in the build pipeline
The official guide recommends installing babel-plugin-react-compiler as a development dependency and integrating it with your build tool. Configuration varies by tool and framework. With Babel, put the compiler plugin first in the plugin pipeline so it can access original source information. The React documentation includes guidance for Vite and React Router and points to framework-specific instructions for Next.js, Expo, Metro, Rspack and Rsbuild.
For React 17 or 18, install react-compiler-runtime in the application and set the target to the corresponding React major version. Avoid copying a configuration for a different tool or version: use the documentation for your project’s build setup.
Choose a rollout scope
You can compile broadly with the defaults or constrain what is selected. The configuration reference documents annotation mode, which selects only functions marked with "use memo", as well as gating and other options for gradual rollout. Selective compilation can limit the initial diagnostic surface and make it easier to compare behavior, at the cost of more configuration and explicit opt-in work. See the configuration reference before changing defaults.
What should you do about useMemo, useCallback, and React.memo?
For new code, React recommends relying on compiler memoization rather than routinely adding manual memoization. Use useMemo or useCallback when you need precise control. For existing code, do not automatically delete every memoization call: the React team advises leaving it in place or testing carefully before removal, since removal can change the compiler’s output. See the guidance on manual memoization and the compiler.
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- Check a component in React DevTools. An optimized component should show the “Memo ✨” badge.
- Inspect generated build output. Look for compiler-inserted runtime and memoization logic.
- Review compiler lint diagnostics. The React Hooks ESLint tooling surfaces issues and patterns that prevent particular components or hooks from compiling.
- Test and profile the rollout. Confirm the app behaves as expected, then measure relevant interactions rather than assuming a badge guarantees a user-visible speedup.
If you need to isolate a problem during diagnosis, the installation guide documents a temporary "use no memo" directive to opt a component out. Remove the opt-out when it is no longer needed.
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Common setup problems to check
- Runtime errors on React 17 or 18: Confirm
react-compiler-runtimeis installed and the compiler target matches the React major version. - Babel integration does not behave as expected: Check that the compiler plugin runs first.
- A component does not appear optimized: Check DevTools and lint diagnostics; the code may be skipped because it violates the Rules of React or cannot be safely compiled.
- No measurable performance change: Confirm the compiler is active, then profile the workload. Compilation is not evidence by itself that the affected work was a bottleneck.
For current setup details and troubleshooting, use the React Compiler installation guide and its linked framework documentation.
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