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Microsoft testing fix for AMD performance issues on Windows 11

AMD Ryzen 9 5950X
AMD Ryzen 9 5950X (Image credit: Rich Edmonds / Windows Central)

What you need to know

  • The latest Insider build of Windows 11 addresses performance issues affecting AMD processors running Windows 11.
  • Some AMD chips see a performance drop of 3-5% when running Windows 11 due to an L3 caching issue.
  • The fix rolled out to Insiders in the Release Preview and Beta Channels on October 15, 2021.

Microsoft released Windows 11 Build 22000.282 to Insiders in the Release Preview and Beta Channels on October 15, 2021. That update includes a fix for an L3 caching issue that can affect the performance of Windows 11 PCs with AMD CPUs. The bug can cause performance drops of up to 5% on affected systems. An earlier report indicates that a fix for the L3 caching issue could roll out to general users on October 19, 2021.

"We fixed an L3 caching issue that might affect performance in some applications on devices that have AMD Ryzen processors after upgrading to Windows 11 (original release)," says Microsoft in the release notes of Build 22000.282.

Microsoft's release notes only specifically mention AMD's Ryzen processors. Some other CPUs from AMD officially support Windows 11, including a handful of Threadripper chips, but it appears that the L3 caching issue only affects Ryzen chips.

A fix for a separate issue affecting Windows 11 systems with AMD CPUs could roll out later this week. The bug is related to AMD's preferred core technology, which shifts threads to the fastest core on a processor. It can cause performance drops of 10-15%. A cumulative update to Windows 11 reportedly made the issue worse. The fix for that problem is expected in a patch from AMD on October 21, 2021.

Sean Endicott
News Writer and apps editor

Sean Endicott brings nearly a decade of experience covering Microsoft and Windows news to Windows Central. He joined our team in 2017 as an app reviewer and now heads up our day-to-day news coverage. If you have a news tip or an app to review, hit him up at sean.endicott@futurenet.com (opens in new tab).

2 Comments
  • The top take away of these patches that their pure existence sheds light on the (lack of) tight cooperation between Microsoft and AMD. I guess we know when we can expect reliable AMD-powered Surface devices in the future...
  • I've installed the update and certainly haven't noticed any ill effects, but any slow-down that occurred on my Ryzen 7 5800X wasn't noticeable in the first place, so I'm not sure whether that improved.