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: 
I've had a lot more crashes since installing IronPython, but the main key to crashing appears to involve solutions with projects in 2 or more programming languages. I won't get crashes in C#-only solutions, nor VB-only solutions, but only in the ones with both (and more!) languages. It might also be that those solutions have a lot more projects.
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...