GRRRRRRRR!
Allow me to clue you all in on a little something that has been going on in PHL for ages. Baggage unloaders/loaders are slow as molasses, and they are the sort who like to walk away from a partially loaded plane at the end of their shift....never mind that the flight has the passengers on board looking at these dolts waving goodbye and not getting the flight going....their attitude is "It's Miller time!" while the people onboard are swearing after a 45 minute delay that they will never fly US again. And you know what? They won't. There is a new sheriff in town, and his name is Southwest. And his rampers and baggage loaders are doing your job with THREE times the efficiency, and at half the cost.
Want more gate space? Fire every local Philly dork who is working for US on the ramp and hire some young, fresh, go-getter attitude workers from CLT or whereever, and get them working in PHL. When planes reduce their gate time - they INCREASE their air time. And a plane sitting at the gate(whether it is due to atc/weather/mechanical or just lazy workers who don't care anymore) is NOT making money! GET THE PLANES MOVING YOU NUMBSKULLS!
Until we get this fixed, there is no hope for US.