I just updated to .18.3 and started a new game. As my bus grew I started seeing from FPS drops. I didn't think much of it, but eventually decided to load the last game I was working on in 17.79? (i think that was the version) While playing that I had consistent 60/60 but now in 18 it was running 55-58FPS (but still 60UPS)
I'm guessing it is due to the new graphics? (water/trees)
If so, is there a place to just turn that off? Specs are below, but the issue is that there was no frame loss in the previous version on the same savefile.