Some might think that there is an issue, because the game does not use Vsync and there is no option ingame. This is no issue with proton, but with the game itself. You can fix that manually.
The correct path to find the file. mentioned in the link above, with Proton is $LIBRARY/steamapps/compatdata/42140/pfx/drive_c/users/steamuser/Application Data/FatShark/Hamilton
Nothing extracted yet.
Whitelist Request
System Information
I confirm:
Playbutton in the Steam client is sufficient.are necessary to run the game.
Issues
remaining issues: