You guessed right! I found the correct logfile which had the app listed as FS2020.
I have a quite powerful rig (11900K, 3090, 32GB CL16 3600, PCIe 4.0 NVMe) and was able to reach stable 30FPS with 100% OXR and 80% render scale within MSFS before. All settings on ultra/max. However, 100% render scale is my personal goal.
This is what I figured out so far:
The settings suggested by @HyperJet2018 had no influence on my visually perceived FOV but unfortunately also no influence on FPS. To find out if the idea works at all, I lowered the percentage down to .5 which gave a plus of around 6-8 FPS. Further down to 0.3 did not show further increase in FPS. Of course .5 is not really an option.
Maybe this helps for further developing the idea. I’ll keep the “new” settings as they may give my GPU some rest from time to time and I could not find any degradation of the quality.
Thanks for all your efforts and ideas!