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Windows 11 Slowdown with Some AMD CPUs

Some AMD Ryzen chip users are experiencing performance issues after upgrading to the newly released Windows 11.

According to the CPU and GPU manufacturer, users may be facing a 3 to 5 percent decrease in performance in some applications, and up to 15 percent in "games commonly used for esports."

In an advisory notice, AMD said "known performance impacts [were] reported on Windows 11 when running compatible AMD processors on certain applications," but further details, including specifically what chips and how many may be affected, were not given.

Breaking down the incompatibility issues a bit further, AMD identified two potential issues hitting users. With regard to the app and game performance hit, this issue is related to the L3 cache in chips to increase latency by three times its normal amount. A second issue could cause additional slowdown for those running eight or more cores in their processor: "UEFI CPPC2 ('preferred core') may not preferentially schedule threads on a processor's fastest core."

Both AMD and Microsoft are aware of the issue and are working on a solution via software updates. Until a fix is available, AMD suggests holding off on using Microsoft's newest OS, which was released earlier this week. "In the interim, customers using compatible AMD processors affected by these issues may continue to use a supported version of Windows 10," read the advisory.

Other Windows 11 Issues
Outside the CPU performance issues, Microsoft is aware of a handful of other Windows 11 compatibility issues in week one. In an online document, the company said there are three known issues, as of Oct. 7

The first is a compatibility issue between Oracle VirtualBox and Windows 11, specifically when Windows Hypervisor or Hyper-V is installed. Microsoft recommends removing Hyper-V, Hypervisor or VirtualBox until a fix is available. Oracle is aware of the issue and will be addressing it in a VirtualBox update later this month.

Next, some compatibility snafus have been found connected to Windows 11 users running Intel "Killer" and "SmartByte" networking software. According to Microsoft, the software "might drop User Datagram Protocol (UDP) packets under certain conditions," leading to online protocol issues. This could result in poor video streaming performance and some Web sites not properly loading. Microsoft is currently working on a solution, which should come in an October security update.

Finally, Microsoft is aware of an issue with Cốc Cốc browser and Windows 11. The Vietnamese Web browser might run into issues opening for some users, and can lead to other unidentified problems. Microsoft said it's aware of the problem and has no estimate for when or if a solution will come.  

About the Author

Chris Paoli (@ChrisPaoli5) is the associate editor for Converge360.

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