I've found it's rarely faster, but usually not too much slower. You do get to let your shit hang out for awhile on the other side though, and I never like leaving expensive laptops and cellphones and wallets just lying there indefinitely.

Also greater chance you get a false positive on the swab and that will blow your schedule as the tear apart all your luggage looking for a bomb or gun that doesn't exist. That easily chews half an hour if you're lucky.