I thought the poor graphics performance I was experiencing with Lion on my 15" i5 2.4GHz macbook pro must have been due to it being a couple of years old, but after going into an apple store and testing a current Macbook Air, MBP and retina MBP all of them display similar or worse symptoms! The frame rate of fade animations and scrolling is clearly far below 30fps. The worst choppiness occurs when opening and closing folders in launchpad. Switching between launchpad screens was also pretty bad. From what i've heard this is due to poor graphics drivers - how has apple allowed things to become this bad even on its current models? Considering the iPhone became known for its smooth and fluid UI, and indeed my 3GS gives a smoother experience than the MBP at the moment, can they not recognise the importance of allowing graphics card vendors to control drivers? I briefly tried the Mountain Lion DP3 (DP4 was meant to have a bug making the frame rate as bad as Lion) and while things are better they are far from perfect. Do other people not notice this low frame rate across all macbooks? I find it pretty annoying and it greatly lowers my perception of the performance of the machine. It's not like these UI animations are as taxing on the GPU as high performance games - the Intel integrated card should be able to handle them fine, as it does with Windows.