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Next.js 16.3 is now available! • Up to 90% less memory in dev • Faster builds, type checking, and rendering • Better tooling for AI agents • Custom error boundaries • Instant Navigations for SPA-like responsiveness nextjs.org/blog/next-16-3 Here's what's new ↓

Long 𝚗𝚎𝚡𝚝 𝚍𝚎𝚟 sessions now use up to 90% less memory. Turbopack used to keep visited routes cached in memory. With disk caching and memory eviction on by default, it can now offload that cache to disk.

TypeScript 7 is a 10x faster native port of the compiler, and 𝚗𝚎𝚡𝚝 𝚋𝚞𝚒𝚕𝚍 now uses it for type checking. Install it with 𝚗𝚙𝚖 𝚒𝚗𝚜𝚝𝚊𝚕𝚕 -𝙳 𝚝𝚢𝚙𝚎𝚜𝚌𝚛𝚒𝚙𝚝@7.

App Router rendering now uses native Node.js streams end-to-end, instead of converting to and from web streams on each request. With that overhead gone, apps handle up to 22% more requests under load in our benchmarks.

React error boundaries used to swallow 𝚗𝚘𝚝𝙵𝚘𝚞𝚗𝚍 and 𝚛𝚎𝚍𝚒𝚛𝚎𝚌𝚝, and could only reset client state. Now 𝚌𝚊𝚝𝚌𝚑𝙴𝚛𝚛𝚘𝚛 defines a custom boundary that lets those pass through, and 𝚛𝚎𝚝𝚛𝚢() re-renders Server Components within the boundary.