Both AMD and Microsoft are announcing that they will fix bugs that are causing problems for Ryzen users on the newer Windows 11. The reduction can be quite significant as it can result in a 15% decrease in CPU performance.
AMD Ryzen Performance Bugs
Both AMD and Microsoft have actually released patches to be able to fix the AMD Ryzen performance bugs that are present in the initial version of the Microsoft Windows 11. This information was according to an AMD knowledgebase article that was reportedly uploaded just recently.