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As it varies which subsystem are slow, there must be a lack of resources. Doubling the RAM to 1GB has improved the performance as I experience the forums. There are lots of things that can be done to tune a server and further improve it, but I think we should leave it to the sysadmin and Rick until they ask for ideas and tips (the linux geek factor is probably quite high on this forum).
What I have noticed, is that many of the anonymous users are reading quite old threads. I suppose they either find these threads trough search engines, or they perform searches locally on the server. Free text searches, as I suppose they are implemented in this forum, with mysql as a backend, can be quite resource intensive.
Personally, I found that turning off "View user's pictures with their posts?" under "Display" settings improved the performance.
I find the forums quite usable now, even if Simon posted a horrendous time yesterday.