HI everyone, I'm getting this issues quite often now and it's getting really annoying for me. The things is if I kind of play some games or watch a movie and mac starts to half freeze. Not entirely because I can still move the cursor and clicking but the dock and the whole system kind of slow down and not responding at all.The only thing I can do is to restart the mac to fix it. Logging out is not helping as well. The first video is showing the issues: http://www.youtube.com/watch?v=eyyRW4EgmBA This is when I restart and it's back to normal. You can tell the difference. http://www.youtube.com/watch?v=yZ_w-TpAVkw Can some experts out there explain to me what the issue is and any way to fix it.