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The first Tuesday of patches for Windows 11 slows down AMD processors even more than the release build

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Hot potatoes: With Intel’s Alder Lake production plummeting in the coming weeks, Microsoft may have spent too much time optimizing Windows 11 for hybrid CPU architectures that combine performance and core efficiency. This resulted in poor optimization of AMD processors in release build that seems to get worse with every update. Fortunately, the fixes are scheduled to be released in a week.

Yesterday Microsoft released Tuesday’s first patch update for Windows 11which introduced a number of fixes to the new operating system. In particular, it resolved compatibility issues between certain Intel networking software “Killer” and “SmartByte” and Windows 11, where users could see disconnected connections and slow network speeds.

The company said in the release notes that there were no known issues with this update, but it didn’t take long for someone to find it based on the extensive feedback that can be found in the Feedback Hub and the known issues present in the release build of Windows. 11. It turns out that Microsoft has managed to further exacerbate the performance issues recently seen with Ryzen processors, just as AMD is preparing a fix for one of them.

To put things in context, the release build of Windows 11 slows AMD processors by up to 15 percent in some workloads such as esports games and single-threaded applications. The guys at TechPowerUP were curious enough to run the AIDA64 Cache & Memory Benchmark and see if anything has improved since this first update. They found that the Ryzen 7 2700X’s L3 cache latency, which is around 10-11 ns on Windows 10, has increased to 17 ns in the release build of Windows 11 and is currently around 32-34 ns after the first monthly patch.

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We were able to confirm these results on a machine equipped with the same processor model. AMD and Microsoft have said that fixes for this issue, as well as the CPPC (Preferred Kernel) bug, will arrive later this month, and after some searching, it looks like they will arrive on October 19 and 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 go back to Windows 10 if you run into performance issues. To do this, go to Settings -> System -> Recovery. You should see a Revert button that you can use to start the downgrade process. You can also check out our guide on how to disable VBS in Windows 11 for better performance.


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