Hi Matt,
The server migration went very smoothly last night and I hope you don't get many stray posts between new and old servers.
I noticed that your forums runs quicker now (query time is much lower), but the forum rendering is faster (but not as fast as it should be) when comparing to my
in perth forums (phpbb), which runs on the same server.
I see that you have Gzip enabled on the forums, try disabling to see if it helps. Gzip compresses the data on the server prior to sending it to the user, user's browser then uncompresses the data for rendering. Gzip will save you some bandwidth, but uses server and user's CPU and RAM, user may get the data quicker, but the compress/uncompress process requires time, hence.
HTH
Franki
EDIT: Viewing threads/posts is very quick. It's the forums index that's slow(ish) - could be the HTML on the index as well...