Exciting features in Next.js 15:

1. React 19 Support: Next.js 15 now works seamlessly with React 19 Release Candidate (RC). This means you can leverage the latest React features for both client and server-side rendering. 🚀
2. React Compiler (Experimental): The React Compiler, developed by the React team at Meta, optimizes your code automatically. It reduces the need for manual memoization (think useMemo and useCallback). Just install the babel-plugin-react-compiler and enable it in your next.config.js. Keep in mind that it’s experimental and might impact build times. 🧪
3. Hydration Error Improvements: Next.js 15 enhances error messages related to hydration (when client-side and server-side rendered content don’t match). Now, you get better error views with source code snippets and helpful suggestions. 🛠️
4. Caching Enhancements: By default, fetch requests, GET route handlers, and client navigations are no longer cached. This ensures fresher data and a smoother experience for users. 🔄
5. Partial Prerendering (Experimental): Incrementally adopt prerendering with the new Layout and Page configuration options. It’s experimental, but it opens up exciting possibilities for performance optimization. 🌟

Remember, these features are designed to make your Next.js development experience even better! Explore them and build amazing web apps. 😊