Next.js 16.3 support on Vercel

This post details Vercel's platform improvements to support Next.js 16.3, focusing on immutable static assets and faster routing at scale. For immutable static assets, Vercel now supports reusing these across deployments, reducing CDN requests by 17% and bytes transferred by 24% for static content, and speeding up deployments by up to 30%. For routing, Vercel improved the route metadata serving layer, making it ~2x faster with ~10x fewer cache misses by combining metadata entries into JSONL-formatted shards. Additionally, observability has been enhanced to query prefetch requests and introduced observability for Partial Prerendering (PPR).