I think Friar will confirm this Ben but a para drop capture is very CPU intensive as the airfield area has to be monitored continuously by the game as it waits for what could be paras landing there. A single point capture requires a much smaller trigger.
On that point Friar, could the airfield capture point be moved away from the exposed position it is currently in and placed eg. next to the control tower or what could be seen as a command tent/hangar? I am thinking that a tank is an easy target currently as it makes it's way across the field, a bit of cover would help.