Next.js 16.3: Instant Navigations
Next.js 16.3 Preview introduces Instant Navigations, a suite of opt-in features that bring SPA-like responsiveness to server-driven Next.js apps. The core idea: navigations become instant by either Streaming (showing a loading shell via Suspense) or Caching (reusing previously cached UI via 'use cache'), while still allowing specific routes to Block and wait for the server. A new Partial Prefetching system replaces per-link prefetching with a single reusable shell per route, reducing unnecessary network requests. Developer tooling includes Instant Insights (slow navigations become dev errors), a Navigation Inspector in DevTools to visually inspect prefetched shells, and an instant() test helper for Playwright. Both cacheComponents and partialPrefetching flags must be enabled to try these features. The release is available now as a preview via npm install next@preview.
