What does Concurrent Rendering in React 18 mean for app performance?

Concurrent Rendering in React 18 is a game-changer for building modern apps. It lets React pause and prioritize tasks so user interactions happen instantly, while less urgent work continues in the background without blocking the interface.

For developers and academia, React 18’s concurrent rendering means apps can feel faster and smoother, even during heavy rendering. It reduces UI stalls by batching state updates and deferring non-urgent renders, making your app more responsive. This shift also introduces new patterns like the createRoot API and transition hooks for better control over rendering priorities.

Code

const root = ReactDOM.createRoot(container);
root.render(<App />);