I was unaware of the fact that if you install the Memcache daemon on your server (in my case Ubuntu 10.04), Mythweb will take full advantage of it.
Aptitude will help you with the install. Make sure you get the daemon as well as the php5 plugin, and add it to a start-up script and include the memcache extenstion in php.ini. There is a ton of help on Google to make it work properly.






