Forgive me if it has already been brought up above, but I find the low FPS on the ground baffling since it does not appear to be related to the size, complexity and traffic at airports. I have noticed in multiple instances that FPS is bad for me (15-22) at smaller airports (like Wollongong and Brisbane in Australia) while in the high 30’s at large airports (like Sydney International). Up in the air, its 40-60. Puzzling.