Question: I've noticed since installing Visual Studio 2010 SP1 that I'm having huge performance issues. It will randomly freeze up on me quite a bit.

I had no performance issues with Visual Studio 2010 before the upgrade. The only add-on I have running is ReSharper.

I'm wondering if anyone else is experiencing performance issues? If so have you found a way to fix them?

Answer: 
So it seems like disabling the Productivity Power Tools is the key to solve this problem, at least to help with slowness. At least it worked out for me. Thanks Mark for your question/answer :)
I seem to remember reading that in SP1 they switch off hardware gfx acceleration. You can re-enable it in the settings somewhere. Apparently for some people it was causing problems so they disable it by default.

I've got it installed on a few machines here and I haven't noticed it running slower, but I've got a dozen plug ins, extensions and so forth enabled as well, so it was never particularly quick...