[Dallas59]

"Windows Vista is essentially warmed-over Windows XP. If you're currently happy with Windows XP SP2, we see no compelling reason to upgrade."

Ok.

[furquhart]

It depends upon your hardware config.

The biggest reason is that, from the benchmarks I've seen, Vista is optimized for Dual Core (or even hyperthreading) processors. I find that my Core 2 Duo machine is much snappier in Vista than in XP.