The packages all see the same transport apparatus through the buildings. It's moving as fast as they can, but in my experiences most of the damage comes from the diverters and collection areas. The diverter technology is getting better each year. I think the "Speed" in Priority mail mainly comes from logistic prioritization. Those boxes get on the truck first.
At this time it doesn't matter. they don't have enough trucks or drivers. I've sent two packages priority in the last month, both should have taken 2-3 days but took 12-14. You can't get blood from a turnip, but you still are paying for the higher level of service.
