Next.js and Turbopack Next.js 16+ uses Turbopack by default for local development: an incremental bundler written in Rust that significantly speeds up dev startup and hot updates. When to Use - Turbopack (default dev) : Use for day-to-day development. Faster cold start and HMR, especially in large apps. - Webpack (legacy dev) : Use only if you hit a Turbopack bug or rely on a webpack-only plugin in dev. Disable with (or depending on your Next.js version; check the docs for your release). - Production : Production build behavior ( ) may use Turbopack or webpack depending on Next.js version; ch…