[DAKz]

I haven't gone through this source since I never had a problem with it being slow, but I do know that in the tsse releases the rules and the faq in the db is formatted with "/" in front of and behind the text in the tables, this really slows the overall performance of the code way way down, and God help you if you ever click on the faq I have seen it take minutes to load. The to simple fix for that code is to simply remove the "/" from those table in the db and speed the entire site up.
Not saying this is the issue here, since I never had a performance problem with TT but might be something to look into if the other suggestions fail.