Optimizing Vercel deployment size and performance for faster loading

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A good way to approach this is to separate build/deployment size from runtime loading performance.

For deployment/build size:

  • Remove unused dependencies.

  • Check for large assets accidentally included in the repo.

  • Avoid bundling server-only packages into client components.

  • Use dynamic imports for heavy UI/client-only code.

  • Keep generated files, uploads, and local cache folders out of the deployment.

For page performance:

  • Use next/image for images.

  • Compress large images before uploading them.

  • Lazy-load below-the-fold components where it makes sense.

  • Check bundle size with a bundle analyzer.

  • Use Vercel Speed Insights or Web Vitals to see what is actually slow.

The most useful first step is usually to identify the biggest files/dependencies instead of guessing. Once you know whether the problem is large assets, heavy JS, or slow server/data fetching, the fix is much clearer.