Hello, we apologise for the inconvenience.
We're working hard to try and resolve this issue.
A thing to try if you haven't would be bringing your render scale slider down (in Preferences) to 75%, some Users have said this has helped with the stuttering.
Also, could we please get your DxDiag file. You can see how in the link below, thank you.
https://support.sega.com/hc/en-gb/articles/9997195057553-How-to-find-my-system-DxDiag