What in the actual hell is going on? I've tried a million things. This game is totally jacked. And then in the forums there is 0 results for a search with 100% CPU even though it's all over google and reddit. Well OK then Ubi. I knew there was a reason I hated you. Most frustration I've ever had trying to play a $3 game with my bro in law.
Whats your PC setup??
It might be your CPU like dbgager said, had the same problem until i bought a new setup now I have it the other way around (max 25% CPU and 100% GPU) but i have a 3800x and a 2070s running at 1440p all maxed now.
Also might have a look at other programs running in the background an intel CPU for example isnt that good at multi-tasking