Principled Technologies has released two Microsoft commissioned reports on Windows Vista SP1 performance. In these tests, Principled Technologies measured responsiveness of Windows Vista SP1 vs. Windows Vista RTM vs. Windows XP SP2 when performing a set of common business and home tasks. The results show that SP1 performs on par with Vista RTM and Windows XP.
The test show that as with Windows Vista RTM, overall performance is on par with Windows XP. It's important to remember that Windows Vista is a more advanced operating system, which includes many more capabilities than Windows XP. By default, Windows Vista includes antispyware, a search indexer, and the shadow copy service. All these work in the background, providing important services to customers, but they of course take up a portion of the PCs memory and processor resource.
On several common business and home operations Windows Vista SP1 was noticeably more responsive after rebooting than Windows XP.
Link: WinVistaClub
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