Hey guys, i've noticed that recently my Mac has been lagging big time, i'm seeing the rainbow pin wheel everywhere, it takes forever for even Apple apps like iMovie, iPhoto Photo Booth to start up, and everything just freezes and i see this pin wheel constantly. This even happens when i have multiple Safari windows open and i'm trying to switch between them. Not to mention 3rd party apps. I have MacKeeper installed and i do daily cleanups, yet it's still slow. I expected better performance from my MacBook Pro, the system it once was when i bought it is no more. How can i get it back to how it was before? My battery also has been decreasing as it's currently at 91% according to iStats at 142 cycles. Last week it was at 87%! whats happening? I calibrate it once a month too!