I had the same problem, but mostly gone now. I have reduced the NumWorkerThreads to 2 in the AppConfig file. I have a very low end system but am able to use NVidea DSR X 4 with this setting. Only very marginal judder remaining. Worth a try - costs nothing. Try searching NumWorkerThread for other posts on this. Please post if this helps or not.
Good luck - BZ
Ive just tested this, no luck... same judder in SC as always (after 20 - 40 sec)