The Denuvo DRM is surely doing some strange things when it comes to fps from the game. Last year, in F1 2018, I along with other people, was complaining about gamefreezes/framedrops. I also indicated it could have something to do with Denuvo, but I didn't get a complete answer on that from Codies. Do I think there can definitely be a correlation between Denuvo and fps, although I can't confirm this. As I haven't got F1 2019 yet, I can't really test it out.