I've a Mac Pro 2009 with a Dell 30" (3008wfp) display. Runs on Snow Leopard 10.6.4. I noticed that the cursor is retarded, it's lagging behind the mouse. It's clearly not an acceleration issue and I don't think I've ever since it before on other Macs — even though they all were with smaller displays. USB Overdrive didn't help, but as I said it's not an acceleration issue. Tried several mouses (Razer, Microsoft and Logitech ones), still the same. Any ideas how to fix are appreciated!