Take into consideration that many drivers for Vista are still in early early development stages.
And the fact is that Vista was designed to run on the newer architecture of today's technology, the "now" if you will.
I have come to realize that although my dual-cores are sufficient for my means, they will never compare to core-duo or quad core for that matter.
Though I may sound redundant, I am simply saying, If you want Vista to run fast you have to give it a fighting chance.
QUAD-CORES FOR EVERYONE!