Most of the lv 50 over geared tank's tend to rush the dungeons as they usually are running around 10 dungeons per day I usually rush the dungeon if no one asks for a full run I do get the chests which has gear in it but if I know the chest only has potions as drop I tend to ignore them as for mob's if I see that every player is level sync'd to the dungeon I tend to take shortcuts bypassing mob's but if I see a new player that has just unlocked the dungeon and is looking cutscenes I try to grab as many mobs as I can without making the run too long