First Windows 11 update degrades Ryzen CPU performance but fixes are coming

Last week following the launch of Windows 11, AMD warned that Ryzen systems are experiencing performance issues with the new operating system, which can reduce gaming performance by up to 15 percent. As it seems, there are some other issues present that we didn't know about last week, but Microsoft is working on a fix. 

AMD and Microsoft identified and publicised the issue with Windows 11 and Ryzen processors last week around launch, noting that a bug is causing high L3 cache latency, thus reducing performance. This week, the first Windows 11 update began rolling out and according to some users, it has made the latency worse and it has also stopped the UEFI-CPPC2 (preferred cores mechanism) from working.

In its own tests, TechPowerUp found that the Ryzen 7 2700X, which typically has an L3 cache latency of 10ns, has risen to 31.9ns following the latest update. Before the new Windows 11 patch, latency was sitting around 17ns.

AMD has responded to this news already, stating that a patch for the preferred cores bug will be coming on the 21st of October, and Microsoft will be fixing the L3 cache latency bug through a Windows Update on the 19th of October.

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KitGuru Says: If you're using a Ryzen powered system, perhaps wait a couple of weeks before making the jump to Windows 11 to avoid performance issues. The fixes for these bugs are just around the corner. 

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