Greeting everyone, and sorry for my english.
Few days ago I have noticed strange bug. In short, when flying at low level with radar altimeter ON, my PFS drops from 50-80 to 14. FPS drops exactly at the moment when RAD ALT reading changes from **** to any value, so it happens on descend, or on tight turns.
What is strange, is that it does not happen right after take off, but only after some time spent flying, and the longer I'm flying at high level, the bigger FPS hit will be when I will descend to lower altitude.
I have created video showing what happens. Most of it is "spam" to spend some time. In this case I spent in air only abut 15 minutes, so FPS got cut to 24. The monet I turn RAD ALT off, fps goes back to proper level, and everything runs smoothly again.