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Compression (Brotli / Gzip) | Glossary

HTTP compression reduces the size of text-based responses (HTML, CSS, JavaScript, JSON) before sending them over the network. The two main algorithms are Gzip (universally supported) and Brotli (newer, typically 15–25% better compression ratio than Gzip at comparable speeds).

Why it matters: Compression can reduce response sizes by 60–80%, directly improving TTFB, LCP, and overall page load time at minimal server cost.

Quick tips:

Enable Brotli with a Gzip fallback — most modern servers and CDNs support both.
Only compress compressible types: avoid compressing already-compressed formats like JPEG, PNG, WebP, or WOFF2.
Verify compression is active by checking the Content-Encoding: br or Content-Encoding: gzip response header.