I just did 15 laps on the server and no big fps drops so far, only two minor stutters (around 0.05s or so) But, here is what I did just before:
- Set rfactor2 to run in 64-bit mode
- Set texture quality to Medium to reduce memory consumption
- Set texture sharpening (in Player.JSON) to Off to further reduce memory consumption
I don't know if these made any difference, but issue is almost gone.