AMD confirms Windows 11 is causing performance issues

At this point, it would be weird if a huge Windows update like
Windows 11 didn’t cause major issues, so performance issues
shouldn’t come as a surprise. Windows 11 version 21H2 or Build
22000.194 has resulted in major performance slowdown, internet
issues, and a host of other problems for some users.

Released on October 5, Windows 11 is the latest version of the
operating system and it comes with a new Start menu,
notification center, and
downgraded taskbar. Benchmarks previously suggested that
Windows 11 will be slightly faster than Windows 10, but AMD has
now confirmed system slowdowns.

AMD and Microsoft are investigating reports of Windows 11
performance issues. According to a support document published
by AMD, Windows 11 could reduce the performance of certain
apps.

As per the document, L3 cache latency may increase by three
times, which could affect the performance of memory-intensive
apps. AMD is expecting a performance impact of 3-5% in certain
apps, while games can slow down by 10-15%.

Microsoft is planning to address these issues in the next
cumulative update, which is scheduled to arrive in October
2021.

Another Windows 11 bug seems to hurt performance by ignoring
the CPU threads. AMD has observed that apps sensitive to CPU
threads may experience performance issues. These problems are
apparently noticeable after you update the machine, but not all
configurations seem to be affected, though.

“Performance impact may be more detectable in >8-core
processors above 65W TDP. A software update is in development
to address this issue with expected availability in October of
2021,” AMD said.

If you’re on Windows 10, you may want to hold off on updating
to Windows 11 version 21H2 (original version) until Microsoft
has fixed or at least offered a workaround for these
performance issues. If you are already affected, AMD recommends
waiting 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,  causes performance to
drop. As a result, benchmark scores may be slightly lower
when benchmarking Windows 11 version 21H2 with VBS enabled.

For those unaware, Virtualization-based Security (VBS) is a
hardware virtualization feature that allows Windows to offer
additional security solutions and protect the operating system
from known vulnerabilities.

Windows 11 VBS

VBS is also used to reduce malicious exploits and remote access
attempts by attackers.

Apparently, Windows 11 now enables VBS by default on new
devices and clean installations, and it seems to be affecting
the performance of machines running on Windows 11.

If you’re upgrading to Windows 11 from Windows 10, there’ll be
no performance issues.

To reduce performance impact, you can turn off VBS by following
these steps:

  1. Open Windows Search.
  2. Search for Core Isolation to open
    Windows Security
    .
  3. Turn off the Memory Integrity feature and
    reboot your PC.
  4. Open Registry Editor and navigate to the
    following location.
  5. HKEY_LOCAL_MACHINESystemCurrentControlSetControlDeviceGuard
  6. Double tap on
    EnableVirtualizationBasedSecurity and set it
    to 0.

Other issues in Windows 11

In addition to performance issues, Microsoft is also
investigating reports of internet issues and compatibility
issues with networking software like Intel Killer and
SmartByte.

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