I have a theory F1 25 (PC)....

I've been paying closer attention the way the game is behaving and I believe that the graphical/fps issue arises after the game loads to the track.  I'm thinking the game isn't loading all the graphic and other elements properly and consistently and this is causing major fps issues for a lot of people.  A lot of people seemingly have high end pcs with high end graphics cards, ram, processor and ssd's and even they're reporting issues with framerate inconsistencies.  If this is true, then I really hope that this gets sorted out.