Hello there,
First, I’m not bilingual so please, pardon my poor english… 
I have a little problem since 2-3 days: I have a very low FPS and without playing, just sitting in the main menu.
I played this game before without any problems, high FPS and so on but now it’s not the same as before. Suddenly, I suffer 20 FPS on the main menu (imagine playing !). I can’t explain this. I moved to my new flat but it can’t be that, I have a better connexion than before. Well, I’m running out of idea, I can’t explain why the game is so low. I tried to play a game, but it’s the same as the main menu => 20 FPS. My other games work as asual, no low FPS, nothing.
I uninstall the game two times then managed to reinstall it but nothing changed at all.
You can see the FPS of my main menu => http://hpics.li/31671ab
My config:
Intel i7 7700k
Asus GTX 1070 o/c
Asus Z270E
G.Skill 2x8 Go
W10 Pro x64
As you can see, I could run the game easily… So if you have any ideas, please share with me, it will be appreciated !