Response Time Checker / Glossary
Compression
Content-Encoding shrinks text responses (HTML, CSS, JavaScript, JSON) before they travel, often to a quarter of their size. Browsers accept gzip, Brotli (br) and, in current versions, zstd.
How we measure it
We read Content-Encoding on the final HTML response.
What good looks like
br or zstd for text, gzip as the fallback; never on already-compressed files such as images.
How to improve it
- Enable Brotli (or gzip) for text types on the server or CDN.
Measure your site
Three cold samples, every phase, and a diagnosis of what is slow.
Open the Response Time Checker