Next.js 16.2 dropped in March with a bold claim: next dev is 400–900% faster. Turbopack is now the default bundler. Server Components get hot reload.

But the number isn't the interesting part.

The boring answer: yes, it's faster

The Vercel benchmarks are real. On projects with 40+ components, cold starts that used to take 7–9s now land around 1–2s. Not magic — Turbopack eliminates Webpack's overhead on module graph analysis.

Project size 15.x cold start 16.2 cold start Gain

Small (~15 components) 3.5s 0.9s ~4x

Medium (~40 components) 7s 1.5s ~5x

Large (monorepo) 12s+ 2.5s ~5x

What actually changes day-to-day

HMR stopped being a "step". Editing a prop in a deeply nested component used to produce a noticeable lag — 200–400ms before the browser caught up. On 16.2 you edit and the screen already changed. The feedback loop gets short enough that you start iterating differently: less "I'll batch these edits to avoid a reload", more "changed it, saw it, adjusted."

Type errors no longer block the server.…