I have exactly the same issue since the latest update.
I got around 40-50 FPS on Ultra before.
Now its nearly unplayable. Even if I start on an empty airport.
It seems that the problem isn’t the FPS itself its more the problem that i got every 1 second a huge FPS drop.
My Specs:
RTX3070
16 GB RAM
1TB SSD
Intel i5 9600k