I've noticed that not only are some pumps slow, some I've used constantly want to shut off even at the lowest automatic shut off. Pain in the ass to have to hold in cold weather. My vehicle isn't old enough or the correct model of GM where the vents had a problem plugging. That and it isn't a problem on all pumps. My son had a vehicle that had the venting problem and his was a problem on every pump he stopped at. About get to the point where I want to just quit and go to another station.