We're experiencing the usual increase in site traffic that happens every September. That's probably part of it. We have more activity and content than ever before, which is weighing on the db and web server.
I also have a feeling that my hosting service views the hardware on which ot.com is hosted as legacy stuff that isn't getting the attention and resources it once did. It's probably outdated and has too many sites running on it.
We should see speed gains when the new software is running on the new hosting service (fingers crossed).
No, I don't have an estimated launch date :)