I am curious if anyone using a Mac with Nvidia 9400M graphics noticed a slowness of the GUI in Lion. On my Mac mini (early 2009) the animations stutter most of the time. Sometimes when I have more than 6 or 7 windows opened I can't even use Mission Control. I press F3, the windows start to zoom out, then freeze for a short moment, then everything zooms back in. The Xbench User Interface Test score says all: - Snow Leopard 10.6.8: 226.87 - Lion: 56.95. That's not acceptable even for a 2 years old computer.