I got a new 27" iMac a few weeks ago, upgraded from a 20" iMac I had for a few years. I was expecting it to be AMAZING and outperform my old machine to no end. Unfortunately I just feel that it isn't very fast and it seems very sluggish. I seem to be getting spinning beachballs and apps freezing quite regularly. I had Safari lock up on me this morning and I couldn't even close the window, I had it full screen and had no access to the dock so I had to actually hard reset my machine. I've NEVER had a mac freeze on me before. Is this normal?