Reduce Apache's Load With lighttpd On Debian Etch | HowtoForge - Linux Howtos and Tutorials
Lighttpd, sometimes pronounced "Lighty", is a lightweight HTTP server that can help alleviate Apache's load by serving static content. Since Lighttpd uses less resources per request than Apache, it generally serves most static content faster than Apache. This tutorial shows how to install Lighttpd behind Apache via Apache“s proxy module.

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