Bit Tech writes AMD confirmed they're cooperating with Microsoft to resolve the many-core Threadripper and EPYC performance scaling issues under the Windows OS:
Now, AMD has spoken to Anandtech on the matter and brings glad tidings: The company is working closely with Microsoft to address the flaw, which it describes as 'very close' to the conclusions drawn by Level1Techs. AMD has promised it will make a public announcement once a patched scheduler or other update is available and that it will also bring additional performance improvements above and beyond those available using the Coreprio 'NUMA Dissociater' mode - though the company hasn't detailed exactly what these are nor how much real-world impact they will have.Until there's an official patch, those running 32-core Threadripper of EPYC CPUs on Windows can use the Coreprio's NUMA Dissociater mode .