No I don't think it is quicker the first time around, I averaged about the same speed wfp as when I was trad,
I didn't have to spend longer on the job the first time around, and the reason for this was, I spent months before changing over wiping the tops of the frames and the frames from the ladder, when I changed to wfp I didn't have as much crap to wash off.
The second time around was faster and the third even faster, you will find your own speed when you get there, don't try to be to fast to begin with.