Has anyone had any problems with their new iMacs momentarily freezing? I've noticed in the last week or so mine has been doing this quite a bit. When i'm watching a video on youtube or even just scrolling through a web page it will freeze every now and then for about 2 seconds and then go back to normal. This happens about every 10 seconds on a youtube video. Just looking at activity monitor now and it says safari is using about 20% cpu and this other process called windowserver seems to jump up to around 35% when i'm scrolling through web pages. Is this normal? I've also noticed that when i'm playing counterstrike it does the same thing with video settings on medium.