One consumer who observed a drop in gaming efficiency of about 8 % after updating Windows 11 to the Windows 11 2023 Update obtained a repair from Microsoft that solved the issue.

Reddit consumer BNSoul measured the efficiency of their AMD 5800X3D earlier than and after updating Windows 11. “To put it easy [sic], each CPU benchmark reveals considerably decreased CPU efficiency after updating to Windows 11 23H2 from 22H2, even after a recent/clear set up.

“I could add an endless list of benchmark results here but just lets say it’s always 23H2 5-8% slower in every single one be it single or multi-thread compared to 22H2,” the consumer added.

The downside, at the least within the Reddit thread, seems restricted to AMD Ryzen CPUs. But different customers have complained with PCs containing Intel Thirteenth-gen CPUs, together with on Microsoft’s site.

Fortunately, after a number of days, BNSoul obtained a response again from Microsoft that apparently solves the issue.

“Received an answer from Microsoft after 3 days,” the consumer wrote in an replace. “[T]hey told me to reset Windows Defender through a couple of PowerShell commands (1- “Set-ExecutionPolicy Unrestricted” and 2- “Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage”) then reboot and allow CPU Virtualization in BIOS (SVM in my X570 BIOS).

“[T]hen in Windows 23H2 open Windows Security and enable Memory Integrity under the Core Isolation settings. Restart and Hypervisor should be running, Virtualization Security will be Enabled and… that fixes the CPU performance issues, CPU now performing as in 22H2 where I had these security features disabled.”

So, put one other manner:

The repair requires you to open PowerShell (Win + sort PowerShell), probably in Admin mode. Then sort:

Set-ExecutionPolicy Unrestricted
Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage

Reboot, and make sure that CPU virtualization is enabled in your BIOS.

Open the Windows Security app throughout the Settings menu, and ensure that Memory Integrity is enabled underneath Core Isolation. Reboot.

If Microsoft is correct, this could hopefully repair any CPU slowdowns you’ve skilled after updating to the Windows 11 2023 Update. After making use of the repair, the consumer stated that gaming benchmarks had been at their anticipated ranges in comparison with Windows 11 22H2, and even some GPU benchmarks elevated.