I was loving the performance of my new 24" iMac until I started playing games. Unreal 2004 is averaging less than 20 fps and is typically dipping into single digits when more action is on screen, making the game unplayable. I have put all the game settings on their lowest and I have tried every resolution, with no improvement. Even the game Redline gets choppy quite frequently. I have the upgraded video card and 2GB of RAM. wtf? Any suggestions are greatly appreciated.