I have been running smoothly on 30-50 FPS on Ultra ever since I got a 2080 TI, back before update 2.
After the last update I was getting below 20 FPS (also when testing the standard landing challenges running smoothly earlier).
Even a complete reinstall did not fix the issue.
Basically MSFS is unplayable for me.
I am tired of playing russian roulette every update. Decided to take a break and continue on playing DCS in the mean time. Will revisit MSFS in a half a years time.
Wish you the best of luck on this very great looking, but super unstable piece of “art”.