Although Vista is new, and fast, sometimes it can seem a bit bogged down. Too many programs and not enough resources could be your problem. This could be due to having Vista Aero enabled. Aero is a resource consuming hog.

Vista Aero will literally eat up your available resources and leave you with not much left at all. Its a spectacular group of features which include helpful animations, transparent menu bars, visual effects and thumbnail previews.

Aero is setup as the default theme for Vista. Disabling it frees up allot of resources and you should notice a difference in the system after you disable it. You will still have the Vista look, but not the resource hogging effects.

Once you disable Aero you will lose the 3-D flip option for your desktop so please take that into consideration before you decide to disable Aero. Its not a definite necessity but some people like it.