[howtogeek]

I’m using xcache with very good luck for wordpress, wordpress mu and bbpress on the same server. Also using mysql caching with very good success.

On a forum, the cache probably shouldn’t be the entire page, but rather sections of it or at least the more expensive queries. A visitor who isn’t logged in should probably see an almost completely cached version of the page.

wp-cache2 for wordpress seems to handle this pretty well, and the built-in caching in wordpress mu also seems to work quite well.