when I turn on the Avionics I experience a 10 to 15 FPS drop. I have done quite a bit of experimenting to see if other settings affect it or not but its pretty consistent. I thought maybe it was my X-Plane installation so I reinstalled but that didn't help at all. I will be at 30-33 FPS with engine running then turn hit the Avionics switch and watch the FPS drop to 15 to 19 FPS. I have done a lot of different combinations from having every setting set to the lowest limits - Low Texture Res, No Cars, Small Window, No clouds, No shadows, No Trees, No Buildings, Airport detail Low, etc.. and its still a drop of 10 to 15 FPS and goes under 20 FPS. My computer specs are - AMD 6300, AMD XFX Radeon R9 290 4GB, ASUS M5A99FX, Corsair 1TB X-Plane Only SSD, 16GB RAM.