I know every PC owner thinks his or her machine slows down over time. I think my 2-year old 17" MBP is slowing. I'm getting the pinwheel more and more. Often, I'm just surfing the net, maybe with iTunes idle in the background. Sometimes streaming iTunes through my Aexpress. On a few occasions I'll add Word for Mac. More and more times, both surfing and switching around programs, I get the pinwheel. Also, when I go into find and start scrolling, say, through the applications list, it takes a good 20 seconds or so to "load" completely and stop moving "jerky". I do have VM Fusion loaded on my machine. When that is running, everything slows down considerably (although I gather it's not supposed to). Is there a diagnostic I can run or something?