It would be very strange if a major Windows update like Windows 11 did not cause significant problems. Windows 11 version 21H2 or Build 22000.194 is said to cause significant performance slowdowns, internet problems and a host of other problems for some users.
Although there are benchmarks that show that Windows 11 is slightly faster than Windows 10, AMD has confirmed the slowdown of its systems.
AMD and Microsoft are investigating reports of Windows 11 performance issues, according to a support document released by AMD, Windows 11 could reduce the performance of some applications.
According to the document, the latency of L3 cache can be increased three times, which could affect the performance of applications that require memory. AMD expects a 3-5% performance impact on some applications, while games could be slowed by 10-15%.
Microsoft plans to address these issues in the next cumulative update.
Another Windows 11 bug seems to be compromising performance by ignoring CPU threads. AMD has noticed that applications that are sensitive to CPU threads may experience performance issues. These problems are obviously noticeable after updating the machine, but not all installations seem to be affected.
“Impact on performance can be more detectable on> 8-core processors over 65W TDP. "A software update is underway to address this issue." he says AMD.
If you are using Windows 10, it is best not to upgrade to Windows 11 of version 21H2 (initial version) until Microsoft fixes or at least provides a solution to these performance issues. If you already have problems, AMD recommends that you wait for software updates from AMD and Microsoft.
In addition to AMD, benchmarking company UL Procyon has confirmed that a feature in Windows 11 called "Virtualization-based Security (VBS)", which is now enabled by default, is causing performance to drop. Thus, the benchmark scores are slightly lower when comparing Windows 11 version 21H2 with VBS enabled.
To turn off VBS follow these steps:
Open Windows Search.
Look for Core Isolation to open Windows Security.
Disable Memory Integrity and restart your computer.
Open Registry Editor (regedit) and follow the path:
HKEY_LOCAL_MACHINE \ System \ CurrentControlSet \ Control \ DeviceGuard
Double-click EnableVirtualizationBasedSecurity and set it to 0.