nonononononono, not slow at ALL. i vectored my first time (upper torso anyway) and it took me around 20 hours, and its not NEAR as good as yuors T_T. check it out if you like...:http://gallery.minitokyo.net/view/118063/
EDIT: whoa. after d/ling your vector, i see that you actually IMPROVED the scan! dude. seriously. this is practically perfection.
great job!