I have a 2009 Mac Pro (4,1) with 2.66 GHZ Quad Core, 240 gig OWC SSD (45 gig still available), 5770 Video Card, and 16 gig of ram. Currently running Mountain Lion. My computer was running super fast after the initial upgrades. Now for the last few months I'm seeing my application launch slower, the dreaded rainbow pizza more often, and some freezes. What can I do to speed up my Mac again? Thanks!