Always about 20 to 25nm.awa6 from airport. Mathijs suggestion to disable mesh is not going to happen. No other 3rd party airports in Europe have this problem. I have a bunch from numerous dev's installed all without issue including other Aerosoft airports. This bug is with LSGG, not my system. I'm uninstalling it. Waste of money.
I'm only flying in X-Plane but in P3D I can get almost stable 60 fps as well - but this is not depending on the software, I personally need 60 fps because of high sensitivity, motion sickness and stuff like that.
Not sure what sim you are talking about, or what your system specs are, but performance such as you describe is completely (hopelessly) backwards. If your talking FSX/P3D then it sounds like things are really and suoer seriously messed up for you my friend. I would pist your situation iver on AVSIM znd seek some assistance.