How to fix high CPU usage of the cumulative update KB4512941

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fix high CPU usage of the cumulative update KB4512941

Microsoft released Windows 10 cumulative update KB4512941 for version 1903 on August 30; however, it appears that the update is causing some issues.

Users on Reddit, Microsoft forum and Feedback Hub app began reporting that after installing the cumulative update KB4512941, Task Manager showing high CPU usage even when the system is idle and wasn’t being used. As a result, impacting the system performance negatively.

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Microsoft acknowledged this high CPU usage problem linked to SeachUI.EXE (Cortana), and they are investigating the issue and will provide an update in an upcoming release.

Users who recently updated their computer and experiencing high CPU usage users can fix this issue by following two ways:

  • removing the update
  • tweaking the registry 

How to fix high CPU usage by removing the update KB4512941

For removing or uninstalling the update from Windows 10 follow the below steps:

  1. Open the Windows Settings.
  2. Click on Update & Security.
  3. Go to Windows Update.
  4. Then click on View update history option.
    view update history
  5. Click on Uninstall updates
    Uninstall updates
  6. Select Update for Microsoft Windows (KB4512941) and then click Uninstall.
    Select the update
  7. A popup will appear asking whether you want to uninstall or not. Click the Yes button.
    Click yes
  8. The system will tell you to restart, click the Restart Now button.

After completing the steps, your computer will roll back to the previous build, which will not have the high CPU usage issue.

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How to fix the high CPU usage by tweaking Registry for update KB4512941

For users who don’t want to roll back or remove the update, they can tweak the Registry settings to reduce the high CPU usage on Windows 10.

Note: Editing Registry settings are risky, and it can damage your Windows installation if not done correctly. We recommend everyone to take a full backup of your PC before going ahead.

Follow these steps to reduce high CPU usage:

  1. Search for regedit in the search box of the taskbar and open the Registry Editor app.
  2. Browse the following location: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Search
  3. Double-click the BingSearchEnabled DWORD and set the value from 0 to 1.
    Double-click the BingSearchEnabled DWORD
  4. Click the OK button.
  5. Then restart your computer.

After completing these steps, users will be no longer able to see high usage spikes.

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