https://www.reddit.com/r/Windows11/comments/17ytpxr/cpu_performance_degradation_after_23h2_update/
Solved
To put it simple, every CPU benchmark shows significantly reduced CPU performance after updating to Windows 11 23H2 from 22H2, even after a fresh/clean install.
CPU: 5800X3D, GPU: RTX 4080, RAM: 32GB 3800 MT/s CL16 dual rank, Board: X570 Aorus elite F38f BIOS. Storage: Nvme 2x Samsung 980 pro 2TB
Core isolation disabled, virtualization based security disabled, copilot disabled, secure boot disabled.
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.
Games are also affected with random stuttering, all of this fixed by rolling back to 22H2…
EDIT/UPDATE:
Received an answer from Microsoft after 3 days, they 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 enable CPU Virtualization in BIOS (SVM in my X570 BIOS), then 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…
