Vista and FSX load time

I was wondering if any one else running Vista and FSX are having problems with long load times. When I install FSX and SP1 on my laptop with XP which is a much slower speed, FSX loads about 3 times faster than when it loads on my Vista Desktop.My hard drive on my desktop is defraged with with Ultimate Defrag and my laptop hasn't been defraged in while so I dont' understand why my load times with Vista are so much longer.Desktop X6600 2.4 ghz 2 gig ram and Gforce 7600gt 256 ram.Laptop AMD turion 1 Gig of ram and shared video not sure of CPU speed, but it barely runs FSX with everything turned down.Once it loads on my desktop it run great I'm getting about 34 FPS with almost everything cranked up but the load time is driving me nuts. I'm also using Ultimate terrain and FSGenesis terrain mesh on both.Eric