Insiders have noticed a few show-stopping bugs with Windows 11, which is now officially available for all eligible PCs. Users have noticed that virtualization-based security, which will be enabled by default in all OEM PCs, can have a drastic impact on frame rates in games. Also being observed is a File Explorer memory leak bug in which closing the Explorer windows does not release back the allocated memory.
https://www.notebookcheck.net/Windows-11-is-now-widely-available-but-gaming-performance-regressions-and-File-Explorer-memory-leaks-remain-unresolved.568613.0.html