I have a 2011 MBA Ultimate. It has always been sluggish when navigating around Photoshop docs with many layers, and of course barely plays Diablo 3. That being said - how big of an upgrade is the HD4000 graphics over the 3000? I bought the Retina MBP, but the size is annoying, I think I'd rather return it and go for the 11". Any real world tests of the HD4000 compared to the 3000, or people who have used both?