Well, I'm seconds away from absolutely losing my my mind over this. I'm hoping maybe an Apple guru or graphic design major can help me out. I have a problem that has been looming for about a year now. A little backstory... There seems to be a slight lag, especially when making bigger circles in a fast motion with the cursor. I've tried to use the Steermouse App with limited success. It's better, but not great. The mouse is a Logitech VX Revolution, and the display is an NEC LCD2490WUXi. I've also noticed the same issue when using an HP 24". It kind of makes editing a pain to be honest, especially with shaping masks and such. Anyone have a similar issue or solution? At work we use a Mac Pro and a G5, both hooked up to 22"ish Dell displays using a corded Apple mouse, and there is no lag at all...dead accurate and a pleasure to work with. I brought my new MBP to work and hooked it up to the cheap 22" Dell, and no lag. Seemed just fine. I should also mention that I've tried multiple USB ports and locations for the receiver, all unobstructed and fresh batteries. Tried the MBP USB ports, the Belkin powered hub I use, and even the side of my Apple wired keyboard. All the same. I've also noticed this on both my 15" Penryn and my new 15" UMBP. I simply cannot edit images on this setup, and that's extremely frustrating considering the amount of money I have spent for a good editing "station". Is this common? I'm really losing sleep over it now as I'm losing money by the minute. Can someone point me towards someone that can help?