As the following example shown, click O to open the Options menu. Go to Graphics tab and change the value of VSync to Enabled.
From my experience, when I set VSync disabled, my GPU is around 90-95%. However, when I set VSync enabled, the GPU usage dropped to 40-45%.
Enabled (Recommend): Prevents ‘tearing” which is an artifact where horizontal lines appear on the screen as you move. However, if rendering drops even -slightly below your monitor’s Refresh Rate then the effective frame rate will be halved.
Disabled: Potentially allows higher frame rates if you can’t sustain your monitor’s refresh rate, but you will see tearing artifacts.