Loading the gitweb.freedesktop.org front page takes about 10 seconds, and it annoys me whenever I load that page. I typically only load it once and then keep it open in a tab. This prompted me to set up a test of Lars Hjemli's cgit which is 1) written in C instead of that horrible language, and 2) has a built-in cache.
It's still pretty new, but it's come a long way in a short time, and has cool features such as a graphical diffstat. Try it out here: http://people.freedesktop.org/krh-cgi/cgit.