You can turn UAC off in 2 seconds, and the Aero flip feature was windows key + tab, alt+tab was improved with better thumbnails.
As for the speed. Not my fault your computer sucks. However, the OS is much improved since its early release. I had tried Vista since the private betas and it had tons of driver problems, but now there is nothing wrong with Vista, not to mention it is more secure than its "competitor" OSX.
Also, superfetch is a great feature if you have the computer to take advantage of it, it makes things much faster than XP.