Just an FYI for you all. I found the culprit for the awful forum lag we were seeing. The links at the top of the boards that let you sort by different fields were causing huge server load. This is because the forum is just too big to remain fully functional on the limited hardware that we have available.
As such, I have had to disable the links (They are still there, but they no longer re-order the results). Unfortunately this will be until further notice.
I hope that none of you will miss this functionality - I understand that it may be harder for you to search for posts now due to this, so please let me know in this thread if it affects you. If I get a lot of people missing this, we may need to find another way.
Thanks for your patience in dealing with the terrible forum performance that we have all been suffering.