I had the same issue. Open the console and run the command d3d_WindowsCursor. It stops the stuttering entirely for me.
Absolutely perfect! Thank you so much Rowey!
I have serious issues with frame drops and flickering when starting supreme commander. However, It seems that enabling d3d_WindowsCursor from the console fixes the issue.
Now I'm wondering if there is a way to enable d3d_WindowsCursor as part of starting the game through the FAF launcher or if the console is the only way of doing this.
Also, if anyone has any idea what might be the cause of the issue, that would also be wonderful. It's been quite the headscratcher for me.
Thank you for any help!