I can definitely perceive a difference in swing characteristics, but I don't perceive it as a difference in swing speed.
On the heavier frame, the hand will naturally swing slower from the shoulder, but the head will naturally swing faster from the wrist to cancel it out.
If I had to vote, I'd vote "the same speed."
POG OS. 368 SW, 12.54" balance, 21.0 MgR/I.
Problend kevlar 16 / Prestretched SPPP 17, 72/50 lbs.