FSX taskbar

I fly FSX always in windowed mode because on the second monitor I need the IVAO screen + FMC etc.When I hide the taskbar the framerates go about 30% up. Same when switching from the 2D-cockpit to the virtual cockpit.When I do the same running FSX with Windows XP I don't see this big difference.Has anybody else the same experience or even better a solution??Werner Verwaal-------------------------------------------------------------------------------------------------------------Windows XP SP3 and Windows 7 dualboot, ASUS P5E, OCZ 2x 2GB, Intel Q9450, 8800GTS 512 MB driver 191.03beta en NHancer 2.5.5.Samsung 22" en Dell 19" monitor DVI connected