This. Absolutely this.
I came hear fearing I am the only one, but the module is showing some kind of “memory leak” type issue.
At first I thought it may be something like all the screens (tgp, grnd rdr, hsi) are being continuously rendered even when switched off, but now it really seems to get worse the longer you are flying it. My PC runs all the other modules just fine in VR, but after the last update, the F16 is also showing this type of performance problem when the datalink is ok. Maybe related
My frames are always locked on 40 and 80, but in Jeff they have been getting down to the low teens on my second sortie. Makes me nauseous and I have to turn it off