go to your documents folder. there there should be a "MyGames" folder. open it. In there should be a folder "FormulaOne2017". open it and go to "hardwaresettings" if you find that folder and in it there's a .xml file called "hardwaresettings_config". Open it and search for this "maskQuality="1" change it to 0. then find "mirrors enabled" and change it to false. That should boost your fps quite a lot I guess.