One other issue has come up. While using Windows and connecting to a big screen tv, putting game to fullscreen mode (1920x1080 @ 120Hz) will show the graphics not centered correctly (left hand icons with fuel amount etc are out of screen) and game is reaaally slow and laggy.
Alt+ tab to Windows and same back into game, and all is well.
After game is over, returning to main menu slows it back down again.
(can be corrected by starting game, and then Alt + Tab again twice, but have to do this at the beginning of every game)
This problem does not seem to exist in windowed mode, but with that the audio is not working.
Not a huge problem, but wondering what could cause it. Have tried 3 different Windows 10 laptops, same result on all, no system setting changes seem to do any difference.