I turn off my PC every night. The low performance is constant from the moment I load into my save to the moment I close the game.
One thing that is interesting about my issues is that my GPU usage stays at 100%, but the temps do not rise at all (they stay low as if it were idle).
Other games like Overwatch, etc all perform flawlessly as expected.
I am currently playing the game on my older desktop and it has flawless performance. Very strange issue.