The React Compiler is a new tool that transforms React components into optimized JavaScript code, automatically applying memoization and enhancing application performance.
React 19 introduces a new type of component that allows rendering separately on the web server, improving performance and enabling faster page loads.
The React compiler is currently in beta and under testing, not yet stable.
By caching UI directly on the server and minimizing client-side JavaScript, React 19 aims to achieve faster applications and improved SEO.