My god. Tek, don't take this personally, REALLY, but your site is messed up. My guess is that it is a combination of things. Your page just took 12 seconds to generate and 964!!!!! queries, which is awful.
If I had to point fingers, any plugin doing extra DB access or network lookups would be suspect. First, get your queries down under 100. That's a good starting point.
- Your viewable-comments thing is probably a big part of the problem.
- Media Manager might also contribute -- I've seen people say that it doesn't cache, but I don't have firsthand experience.
- 'You said' lookup might be big. Dunno.
- 'They came from' might be big as well.
Easiest thing to do is turn off the inline comments, media manager, you said, they came from, etc. Then, turn things on one by one, each time doing multiple page loads to check the generation time. Inline comments should be the last thing to turn back on.
If you'd like me to help debug directly, you can install the CG-PowerPack, and give me an admin account, and I can quickly turn some stuff on to profile the queries and where they are coming from. Lemme know if you get stuck trying to debug yourself and need a second set of eyes.. cgcode at chait dot net.