I feel that in DFW A - even at it's worst, like a Monday morning with the line to the other end of the ticket counters -- it moves pretty quick.
DFW C is sooo bad though (it has half the capacity of A doesn't it?. Sometimes I'll go through the regular Priority line if it's short enough - I'll print out my BP at home if I know I'm travelling out of C just in case I use the Priority line so that I can at least keep my shoes on and easily show the agent my BP without having to fret about showing the agent the mobile BP and getting the phone to the x-ray.