competition ribs time

I usualy cook ribs between 5-6 hours in my traditional wood burning smoker at 220-230,

looking in my new fec100 cookbook page 32 and 33 recipes one for 2 1/2 hours and one for 3 and 1/2, is this cooker that different, briskets still call for about 12 hours so do butts, why ribs so much less