My game cant go full screen

When i launch fc 24 it defaults to 1280x720 resolution. Despite my monitor having 1920x1080. 
- The game cannot change from windowed mode.
- If i change the game from 1280x720 resolution to 1920x1080 the fps drops from 60 (max) to 15 instantly.
- If i change the game from 1280x720 resolution i get 1-2 seconds of input delay.

- While having 15fps and 1-2 seconds of input delay only 30-50% of my hardware is being used (from task manager)