PC World Tests Final Version of Vista SP1
Mac writes "PC World ran the final version of Windows Vista SP1 through a first set of tests last night. Here's the bottom line: 'File copying, one of the main performance-related complaints from Vista users, was significantly faster. But other tests showed little improvement and, in two tests, our experience was actually a little better without the service pack installed than with it.'"
"The Windows Vista SP1 install process clears the user-specific data that is used by Windows to optimize performance, which may make the system feel less responsive immediately after install. As the customer uses their SP1 PC, the system will be retrained over the course of a few hours or days and will return to the previous level of responsiveness." source
Any performance tests that haven't taken that into account somehow can't be taken too seriously sadly, it's a difficult thing to deal with for review, much like a fresh Vista original release, though at least SP1 shouldn't blank out your index system's index, and cause that to re-catalog everything too, that really would cripple immediate post-install tests.
http://blogs.technet.com/markrussinovich/archive/2008/02/04/2826167.aspx
Whoa, a lot of people dont get this at all. Here's a hint.