UPDATE!
There was an update for my Nvidia graphics cards, but this did not solve the issue. I have noticed that my CPU usage goes up drastically once the Technic Launcher logs into Tekkit, and it opens up the Tekkit Java Window. The CPU goes to 100% and stays between 95 and 100% while I'm having this issue. I am running two 8800 GTSs in SLI on my Dell XPS M1730, and I have a Core2 Extreme X9000 @ 2.8Ghz w/4 GB of RAM. I have completely ruled out my internet connection by running Speed Test with 10.6 Mbps Download and 4 Mbps Upload with a 41ms ping, and have also checked to make sure that it wasn't using an on-board video card instead of my 8800s, as I've read on other bug reports. This issue comes and goes. One day I will be running at 70-120 FPS, and then a day or two later it's back to 0-12 FPS. I'm at a loss...
** Fixed** I don't think this will help anyone else, but I solved my problem. So the battery on my laptop hasn't been charging for a while, which was ok because I was always plugged in (the battery life on my m1730 is like 30 minutes on a new battery...) So I decided to order a new battery and a.c. adapter. Got the adapter today and plugged it in, and the battery charges fine. Mojang's servers were down, so I tried to play counter strike: source(I tried last night at a futile 9 FPS...) FPS was up to 70-100+! I'm guessing the a.c. adapter was going out, and since it is the PSU for my laptop, my hardware wasn't getting the voltage it needed. This is probably why my CPU was maxed... once I get a chance, I'll try Tekkit and let you know. This seemed to fix it!!