Hello. System Spec: Late 09 21" 3.06, GeForce 9400, 4gb ram Currently I have itunes and safari running, if i enable the visualizer my imac is noticeably slower, especially when browsing the internet. I thought it might be the fact I was running a second 1080p display from the 9400 would have caused the slow down. But the same thing occurred after i disconnected it. After repairing permissions and restarting, pmram etc. Is the 9400 causing the slowdown? I know its fairly old but itunes visualizer and safari should be quite basic tasks. Its not the end of the world i know but does the 27" imac have similar issues as i plan to upgrade my machine in 2011. Thanks Have a wonderful new year!