This article is a giant stinking pile of crap designed to get pageviews with a hyped-up BS title.
The changes they made in Windows 7 won't actually make your CPU run any faster - that's just not possible. What they did was fix the slow startup / shutdown / sleep speeds, improve the multi-threading for multi-tasking, use less drive space, and tweak plenty of UI features to be faster, feel faster, and just be more slick overall. This test didn't check for Any of those.
An automated test will never show the difference in speed for those types of common user behaviors. You can only write I/O at the speed of your hardware, and any improvement is going to be tiny when it comes to that.
Now if there was a test on how quickly you could infect your system with viruses, XP would win every time, hands down.
Windows 7 is very, very slick.