Stuttering?

I always get severe stuttering while playing Age of Empires:Definitive Edition, and I wonder if anyone else has had the same issue. The FPS is never stable and GPU usage is all over the place, especially when I move the camera. I game with an Intel i5-4670K and R9 290X. Link is a screenshot of my GPU usage in a short game in the Glory of Greece/Alexander the Great campaign. I am capped at 144FPS(though it never holds that high) and I was wondering if you can uncap the game.