I upgraded to 8GB of RAM (see 3 posts up for my full setup) and then upgraded to Parallels 7 with the same Bootcamp Windows XP and it's working great. I think the problem here is that modern OSes are too RAM hungry for anything less than 8GB+ to run two at a time. I have the RAM slider set for 3 GB and Solidworks 2009 runs well. I fear what will happen when I go to Win 7+SW 2013, though, as both of those will most assuredly be more RAM hungry. I wish I could've gone to 16 GB of RAM as that would surely have been enough.
For those of you having trouble, have you gone into settings and adjusted the RAM slider? I adjusted it to the max of the green part of the bar (it goes from green, to yellow, to red). If you have 4 or especially 8 GB of RAM, try adjusting that and see what your results are like. I really have no idea if this will help or not, but am curious in the event I have to update to Lion in the near future.
Last edited: Jul 11, 2012