AMD and Microsoft have finally acknowledged poor L3 cache performance in Windows 11, and a fix for the same is on the way in the form of a Windows update later this month. AMD also notes that CPPC2 may not schedule threads properly on preferred cores in Windows 11 and is investigating a fix.

https://www.notebookcheck.net/AMD-and-Microsoft-finally-acknowledge-poor-L3-cache-performance-and-CPU-scheduling-issues-with-Ryzen-processors-in-Windows-11-after-nearly-three-months-of-complaining.569990.0.html