nextjs-turbopack

Slow Next.js dev startup in large applications can be sped up by enabling Turbopack, which uses incremental bundling and file-system caching to significantly reduce cold starts and improve hot module replacement speed.

Turbopack improves hot module replacement by using incremental bundling behavior, which recompiles only the changed modules instead of the entire application, resulting in faster updates during local development.

Yes, Turbopack uses file-system caching to speed up Next.js restart times. By reusing the cache from previous builds, subsequent development server restarts become much faster, avoiding full recompilation.

Choose Turbopack for everyday Next.js development to maximize dev speed, but switch to webpack when you encounter compatibility issues or need specific webpack configurations that Turbopack does not yet support.

To diagnose production bundle size issues in Next.js, you can run a bundle analysis. This Skill provides guidance on utilizing bundle analysis tools alongside Turbopack or webpack to identify oversized dependencies in your production bundles.

Turbopack guidance for diagnosing slow dev startup and hot module replacement applies specifically to Next.js 16+ local development environments to ensure proper incremental bundling and file-system caching reuse.