Verified answer

That we be so much worse than what you have now it isn't worth it unless you are trying to do multiple screens. The only reason to do what you are saying is to have multiple screens, the one connected with the USB device will have a bad refresh rate and not recommended for any games.

I'm afraid you're stuck with the exiting graphics, so gaming is limited.

Because the video shares system RAM, you can add more memory to improve general performance.

not much u can do to your laptop.