Next.js 16.3 introduced Instant Navigations, enhancing the speed of page transitions in apps using React Server Components.

Within Vercel's v0 platform, a coding agent with a new Skill was used to write failing tests, address slow navigations, and verify improvements. This approach allowed for faster navigations without relocating data-fetching or rendering to the client. The results showed significant speed gains in production, as demonstrated by shared performance graphs.

Source: nextjs.org