I just want to share my experience with Windows 8 in regards to system performance compared to OS X Mountain Lion. Scrolling in Retina Mode in Mountain Lion has been quite choppy. Some sites feel better than others inevitably due to how they are made. I first got an rMBP back in July and returned it because of the lag. That was the 2.6Ghz version. I re-bought the rMBP last week and I'm now running the 2.3Ghz model. I installed Windows 8 a couple of days ago, no hiccups except I had to find an updated driver for the Broadcom Wi-Fi (If anybody needs help with that just PM me). I updated the Nvidia Gfx drivers. I am running the Metro UI in 2x Mode (i.e Retina) and have gone a step further and checked "make everything on your screen bigger" in the ease of access settings. There is no lag at all. Not a single drop in the 60hz refresh/frame rate and I've been on some heavy photo sites like Facebook and Flickr all the while having music playing in the background and various other apps open like Skype and the Windows Store. I may take a video of the comparison to show how big the difference actually is. Going back to ML, I did install gfxcardstatus and made sure the discreet GPU was running and I still get that tremendous, unacceptable lag when scrolling. This thread isn't a Windows 8 vs OS X thread; I am just interested in people's thoughts on why Windows is handling this machine so much better? Is this bad coding on Apple's part? OpenGL vs DirectX? Maybe even the inertial scrolling feature in OS X is taking a huge toll on the GPU? I have set mouse scrolling settings to 1 both horizontally and vertically in Windows 8 which works well with the trackpad. It's frustrating to have a machine designed to work with OS X, a machine we bought to work with an OS we love, but that runs so much faster with a different operating system? What happened to the Apple "ecosystem" when it comes to Macs?