If you are pulling at a decent pace meaning it's not the whole floor but still quick enough I don't really see a problem with that. I have seen tank that pull the whole floor/area and we end up wiping due to various reasons, which waste more time since your buff are all on CD now. You really do not have to pull every single thing for a speed run, speed pulling works the same as well and safer considering you do not know the skills of the players you are with.