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The first Windows 11 patch released Tuesday made AMD CPUs run slower than the release version

One thorny issue: With Intel's Alder Lake down in the coming weeks, Microsoft may have spent too much time optimizing Windows 11's hybrid CPU architecture, which combines the core of performance and efficiency. This results in AMD CPUs being poorly optimized on releases, which seem to get worse with every update. Thankfully, the repairs will be completed within a week.
Yesterday, Microsoft released the first patch update for Windows 11 on Tuesday, bringing some fixes to the new operating system. Most notably, it fixed compatibility issues between certain Intel Killer and SmartByte networking software and Windows 11, where users saw connections drop and Internet speeds slow down.
The company noted in the release that there were no known issues with this update, but it wasn't long before someone could find one based on extensive feedback, feedback centers, and known issues that occurred in the release build Windows 11. As it turns out, Microsoft managed to make the Ryzen CPU performance issues worse, and AMD is working on fixing one of the issues.

Specifically, the release of Windows 11 slowed DOWN AMD CPUs by 15% in some workloads, such as esports games and single-threaded applications. Curious, the folks at TechPowerUP launched the AIDA64 cache and memory benchmark to see if there were any improvements since the first update. They found that the L3 cache latency for Ryzen 7 2700X CPUs, which was around 10-11 ns on Windows 10, increased to 17 ns on the Windows 11 release, and is currently around 32-34 ns after the first month of patches. We confirmed these results on a machine equipped with the same CPU model. Both AMD and Microsoft say that patches for this issue and a CPPC(Preferred core) vulnerability will be released later this month, and after some digging, they will be released on October 19 and October 21, respectively.
If you've just upgraded to Windows 11 on an AMD-based PC, you should know that you have up to 10 days to roll back to Windows 10 if you run into performance issues. To do this, go to Settings; The system -The recovery. You will see a "Go Back" button that can be used to initiate the downgrade process. You may also want to check out our guide on how to disable VBS in Windows 11 to improve performance.

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