Glossary Terms

Caching

Caching speeds up a site by storing a ready-made copy of something and reusing it, instead of rebuilding it from scratch on every request. It happens in several layers at once: the visitor's browser, your server, and the CDN in front of it. Most caching problems come from those layers disagreeing about what the current version is. When it works, caching is invisible and the site just feels fast; when it's misconfigured, people see stale or inconsistent pages.