![]() a quick look through vista documentation revealed that the gui was gpu accelerated which accounted for the speed difference, however the non-Aero interface under vista was not hardware accelerated. ![]() windows 7 feels "snappier" than vista and vista felt snappier than xp and the reason is simple: Aero is hardware accelerated, i ran both the 32 bit and 64 bit versions of vista and realized what was happening when i was shutting off services to optimize vista (the way we used to optimize xp and 2k), when i shut off Aero vista went from being significantly snappier than xp to being significantly slower than xp (in my case xp 64). The balance of kernel vs user mode thread scheduling can be adjusted to suit the general use of the OS (e.g., audio/video, gaming, server etc) and applications can be locked to a specific processor core - this prevents threads being switched between cores (even single threaded). Windows 7 also has new stuff under the hood that can affect performance. There's really bugger all difference between the two except that Windows 7 feels snappier (which I can attest to).
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