React 19 has features like Server Components and Server Actions, which optimize performance and simplify data handling by shifting more logic to the server. Server Actions make API endpoint creation and form handling easier by automatically managing pending UI states, error handling, and optimistic UI updates.
Thursday, May 23, 2024React 19 RC had changes to its Suspense behavior that caused concerns about performance. The React community's feedback led to a heated discussion, so the React team decided to delay the release to address issues.