Flew tonight in the PW freighter, Leipzig to Luton (ini version). Flight started out just fine, no issues, FPS hovering about 60, TLOD 100.
However, flying at FL340, the frame rates dropped, and dropped, and dropped so much that by the time we were on final approach to Luton we were down to 12(!!!) FPS. No point any more at that point to continue the flight, even with an autolanding, because once we landed I had no way to control where the plane was going.
The only thing I can think of that would have contributed to the terrible FPS drop was opening and closing the default EFB, but other than that, nothing out of the ordinary.