Brotli compression is enabled for text assets

Uncompressed text assets — HTML, CSS, and JavaScript — transfer at their full source size over the network. Brotli compression reduces text payload by 15–25% compared to gzip, and 60–80% compared to uncompressed, which directly maps to the ISO-25010 resource-utilisation quality attribute. A 200KB JavaScript bundle served uncompressed arrives as 200KB; with Brotli it arrives as approximately 45KB. At 4G speeds, that's roughly 250ms of avoidable download time per bundle. Marketing pages with multiple JS chunks and third-party scripts compound this: every uncompressed text resource adds to the total transfer time that feeds into FCP and LCP. Serving compress: false without an external compression layer is an explicit choice to send more bytes than necessary.

Verify compression is enabled and not explicitly disabled in your Next.js configuration — the default is compress: true.

// next.config.ts — ensure this is not present
// compress: false  ← remove this if it exists

// Correct default
const nextConfig = {
  compress: true, // gzip compression via Next.js server
}

On Vercel and Netlify, Brotli is applied automatically at the CDN layer — no configuration needed. For custom nginx servers:

# nginx.conf
brotli on;
brotli_types text/html text/css application/javascript application/json;
brotli_comp_level 6;

Verify compression is active by checking the Content-Encoding response header: curl -H 'Accept-Encoding: br' -I https://yoursite.com should return content-encoding: br.