"This tutorial highlight the necessary steps to configure
Varnish and lighttpd to serve your Plone site. The primary benefit
is that you can tremendously improve performance of your Plone. In
Bitubique.com case, the stock Plone installation was only able to
push up to 13 requests per seconds, but putting Varnish and
lighttpd in front push the performance up to 160 requests per
seconds. That's 12 times faster than stock installation!
"Please note that you don't need to use lighttpd if you only
have one Plone site and does not have other website on the same
machine, and does not plan to run virtual hosting or serves sites
not running Plone..."