I am having an issue when I enter data into the fmc after the aircraft is airborne. Anytime I change a cruise alt, enter vref data, etc. The FMC drops the frame rate and causes xplane to freeze or run very slow for a few minutes. I am not using bit defender so I am not sure what is causing the problem. The fmc is slow to use on the ground, but it does not interfere with the sim like it does when airborne.