I've been experiencing the same thing. It's really maddening at times (30 seconds for a post to clear).
I'd like to offer my help in trying to get to the bottom of this. While I am not an expert on servers and net traffic, I do program for a living and have a bit of experience in these areas.
I don't know if I can actually help, but I do have the time and I'm willing to give it a shot.