backtrack 3 does the same on my m2npv-vm (i think) asus desktop... it boots about 4 times faster on my laptop. once the os is up tho i see no lag.
my guess is that the bios, when booting off usb, boots on usb1. then when backtrack loads its usb2 drivers it speeds up?
(it seems to go faster after it does the "loading usb support")



