A french researcher has run tests and claims that Windows new operating system, Vista, is slower than XP. Things like how fast menus appear, how quickly you can open a folder from the desktop, and even how precise the mouse pointer is -- all slower on Vista than on Windows XP. In fact, the researcher found that Vista is at the same level of performance that Windows 98 was. And that was a loonnnng time ago.
So, think twice before taking the vista plunge. You might be better with XP.