No time lost for me
Not only are we not speaking about individual pulls, but the dungeon itself would take less than 30 mins. You would save at most 5 mins on a 20-25 mins run assuming the DPS is equal in both instances. It would still give you a chance at the item in question, and if you had gotten it you wouldn't have needed to wait that extra 30 mins. I understand what your saying but like I said a bit earlier I can reverse it all as well and just take a 30 mins cooldown and let the group find a tank who will speed pull better for them. If you "politely" asked them to speed up, then your out of the question and you aren't one of those people.