Unless they plan on changing something in the animation, there's not really much you can do about it. Part of the problem is that GSX can only do one thing at a time because the vehicles would collide into each other if it didn't. So you couldn't really have catering start happening as the de-boarding was taking place. Likewise, you couldn't start loading cargo immediately after you finished unloading. Looking at the ACAP sheet, a Boeing 757-300 can be turned around in 55 minutes, assuming 243 passengers on board being deplaned at 18 per minute and boarding at 9 per minute. Baggage unloading is assumed to be 15 bags per minute with loading being 10 bags per minute. The ACAP sheet is also indicating that passenger de-boarding, cargo unloading, galley servicing, and refueling are all started at the same time with new bags being loaded immediately after the bags from the previous flight got unloaded, which isn't possible with GSX. Ultimately, it's a fine balance between what's realistic and what's reasonable. It says here the forward cargo hold can be unloaded and reloaded in 28 minutes, and the aft cargo hold can be unloaded and reloaded in 35 minutes. If the entire turnaround was done in real-time with GSX only being able to do one thing at a time, you'd probably be looking at an hour and a half for a turn for the 757, I am guessing, and I don't know if anybody would really want that.
That said, the container loading isn't really any better. I've noticed that even with five containers per container train, the containers are still being loaded and unloaded even after the passengers have been completely boarded and de-boarded for the 747-400. Not what I would call realistic, considering a 747-400 can carry 32 containers, but what else are you going to do. Start throwing in more containers, and the turn would easily take two hours or so given the speed that GSX gets anything done.
