I did noticed it a couple days ago that when I start playing iTunes cause the overall performance drop. When I checked a processes in Activity Monitor the result is...
It never happens before I upgraded to 8.0.1 Is anyone have a same problems like me
(I'm using a MacBook Pro Rev.D)

It never happens before I upgraded to 8.0.1 Is anyone have a same problems like me
(I'm using a MacBook Pro Rev.D)