"With the initial performance characteristics of Windows Vista leaving much to be desired (see our previous post on the subject), many IT organizations have put off deploying the new OS until the first service pack (SP1) is released by Microsoft early next year. The thinking goes that SP1 will address all of these early performance issues and somehow bring Windows Vista on par with - or at least closer to - Windows XP in terms of runtime performance.

Unfortunately, this is simply not the case. Extensive testing by the exo.performance.network (www.xpnet.com) research staff shows that SP1 provides no measurable relief to users saddled with sub-par performance under Vista."