I would assume you've already tried this since you've tried compiling the kernel, but have you tried the tweaks for FF?: Speed Up Firefox

I would use a slightly higher value for the initial paint delay though (100-150). Having to redraw the page over again is often slower than just drawing it when enough information is in.

There's some others too but I can't remember them off the top of my head nor can I find an instruction page for it....

So you don't get slowdowns when you visit other larger vBulletin forums?

Also, something I found interesting is that you have a lot of lag to your network, which uses a 10. address instead of 192.168. that I usually see on home networks: 5/41/16 min/max/avg *shrug*
I really need to work on more networks. I'm horrible setting up/fixing wireless connections and certain routing issues