I recognize, that there’s no fps degredation while staying on the ground. Means: start a flight, stay in the cockpit and switch to VR. Just stay there. When not moving, the GPU is throttling after a while for a small amount and fps are dropping. But moving the VR-device a bit, switches back to the full amount of frames like at the beginning.
The loss of frames occurs when in flight. Means: enter the cockpit, prepare your airplane, taxi, fly one or more goarounds, perform your landing. In that time the framerate drops permernantely and slowly and won’t recover. Mostly at 16 fps, the screen get stuck and either CTD or screen freeze occurs.
Seems like a memory leak or something else.