Now stable in Next.js 13.4, the new App Router builds on React Server Components and React Suspense to improve data fetching, page loading, and the developer experience.

Next.js 14 offers significant performance boosts, including 53% faster local server startup and 94% faster code updates using Fast Refresh.

React 19: From server functions to optimistic updates The release paves the way for full-stack applications, but also brings many innovations for the development of single-page applications.