It'll be Lee cleaning the memory for us.
No doubt he has a ninja PC so hasn't noticed, but when you go through all the texture and models and delete them to free up the memory, it takes ages. One of my DBPro games suffers from the same problem, when you quit out it cleans up after itself and causes a delay in some PC's, like 3 or 4 minutes. The solution to that was to Alt+F4 to quit right out without going through the cleanup, dunno if that would work with FPSC. Cleaning up the memory when an application is done should leave the PC in a better state than not, like when you try to play too many games between reboots, your memory get's clogged up and the PC eventually crashes - which nobody wants while working on their FPSC game.
Van-B
Put away, those fiery biscuits!