Gzip or Brotli compression is enabled for text assets

Gzip compression reduces HTML, CSS, and JavaScript file sizes by 60–80%; Brotli achieves 15–25% better compression than Gzip. A 500KB JavaScript bundle uncompressed is typically 150KB gzipped — a 350KB savings on every cold load. Without compression enabled on a custom server, every user downloads the raw uncompressed file. Managed platforms (Vercel, Netlify, Cloudflare) enable Brotli automatically, but projects deploying to a custom Express server, Docker container, or bare nginx config must configure it explicitly. ISO 25010 performance-efficiency.resource-utilization identifies uncompressed text delivery as a direct and avoidable resource waste.

Enable compression at the server or proxy level. For Vercel or Netlify deployments, compression is automatic with no configuration. For custom Express or nginx servers, add compression middleware or directives explicitly.

// Express server — src/server.ts
import compression from 'compression'
import express from 'express'

const app = express()
app.use(compression()) // enables gzip by default; add shrink-ray for Brotli

# nginx.conf
gzip on;
gzip_types text/plain text/css application/javascript application/json;
gzip_comp_level 6;
gzip_min_length 256;

brotli on; # requires ngx_brotli module
brotli_types text/plain text/css application/javascript application/json;

Verify compression is active with: curl -H 'Accept-Encoding: gzip, br' -I https://yourdomain.com/bundle.js | grep Content-Encoding