https://wccftech.com/amd-windows-11-may-cause-performance-dips-of-up-to-15-in-cpus/

Wccftech reported a few days ago about known issues appearing after users have installed Microsoft's newest Windows 11 operating system—Oracle VirtualBox software and Cốc Cốc browser compatibility issues, as well as Intel networking issues. Today, AMD reported issues that their Windows 11 compatible AMD processors were having with performance while running certain applications after the new OS installation.

Reddit user axaro1 posted a screenshot of the difference in performance before the fix between AMD and Microsoft.