New Windows 10 update bring major performance issues

Microsoft recently released the Windows 10 KB4512941 update for the Windows 10 May 2019 Update, and while the update has brought a number of fixes, it appears it has also introduced a serious problem where some users are seeing incredibly high CPU usage after installing the update - which is caused by Cortana, Microsoft's voice assistant. An initial workaround had users replace the cache folder with an earlier copy to resolve the issue but most admins would have to uninstall the cumulative update, copy the cache folder before reinstalling it. The problem can arise on systems where Bing Search has been disabled, and a series of workarounds have been suggested while Microsoft works on addressing the problem. "Therefore, in order to disable Start menu search from sending search queries to Bing, you have to fall back to blocking it with the firewall-instead of using the registry key-which is not ideal as it's a somewhat blunt method". Microsoft said in a knowledge base article that the update was supposed to address numerous issues affecting Remote Desktop, Windows Sandbox and other aspects of Windows 10. The company split Cortana and Windows Search in Windows 10 1903, and improved web search in 2017 by adding better previews to the results. The error that causes the high CPU load, seems to have been installed since August by then published updates. The reports did not receive many votes however and it seems likely that Microsoft did not prioritize the bug because of that.

Type regedit.exe and hit the Enter-key.

It's not clear why Cortana made a decision to be a processor hog with the KB4512941 update.

Locate the Dword value BingSearchEnabled.

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Another option is to uninstall the cumulative update to go back to the previous version.

The past year has seen Windows 10 overtaking Windows 7 and continue to grow its lead over this older OS with huge month-on-month gains.

It is unclear at this point how widespread the issue is.

"Microsoft strongly recommends that you move to Windows 10 sometime before January 2020 to avoid a situation where you need service or support that is no longer available".

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