What you need to know
- Microsoft is now investigating a bug in the latest optional cumulative update for Windows 10, KB4512941.
- The bug is causing CPU usage to spike for some users, and it's related to SearchUI.exe.
- There's no official fix as of yet, but Microsoft says it will "provide an update in an upcoming release."
If you've noticed some odd CPU behavior since installing the latest cumulative update for the Windows 10 May 2019 Update, you're not alone. After user reports began springing up around the web, Microsoft has acknowledged that there is a bug with the update that causes high CPU usage spikes related to SearchUI.exe after installing KB4512941.
It's unclear how widespread the problem is, and Microsoft hasn't provided an official explanation for the root cause. There's also no fix for users to apply just yet, but there are ways to correct the issue by either removing the update or tweaking registry settings.
We are currently investigating an issue where users are reporting high CPU usage linked to SeachUI.EXE after installing the optional update on August 30 (KB4512941). We will provide an update in an upcoming release.— Windows Update (@WindowsUpdate) September 3, 2019
While Microsoft says it is investigating the issue, the company only says that it will "provide an update in an upcoming release." The KB4512941 update is an optional update, so it's likely that we'll see Microsoft patch the issue in its regular monthly "Patch Tuesday" release, which is due out on September 10. Until then, your best option is to roll back the cumulative update to get rid of any negative performance impacts from the CPU usage spikes you're seeing.
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