How to fix high CPU usage after installing update KB4512941 on Windows 10

Updated September 5, 2019: Microsoft confirmed (opens in new tab) that it has received reports of the issue and stated that they "are working on a resolution and estimate a solution will be available in mid-September."

On August 30, Microsoft started rolling out update KB4512941 to address a slew of issues with devices running the Windows 10 May 2019 Update (version 1903), but it appears that the update is causing some new problems.

According to a number of complaints from users seen here and here on Reddit, Microsoft forums (opens in new tab), and Feedback Hub app, after installing update KB4512941 — which bumps the version to build 18362.329 — Task Manager may report constant high CPU usage (even when idle) negatively impacting performance on devices where Bing has been disabled for Windows Search.

While Microsoft hasn't acknowledged this as a problem on Windows 10, reports suggest that there's a problem with the Cortana integration causing the SearchUI.exe process to spike, which also affects the Start menu functionality.

The problem doesn't seem to be widespread. But if you recently updated your computer, and you're noticing high CPU usage, you can fix this problem by removing the cumulative update or modifying the Registry.

In this Windows 10 guide, we'll walk you through the steps to deal with the high CPU usage after installing build 18362.329.

How to fix high CPU usage with KB4512941 removing update

The easiest method to overcome the high CPU usage on Windows 10 is to remove the update from your device.

To uninstall update KB4512941 from Windows 10, use these steps:

  1. Open Settings.
  2. Click on Update & Security.
  3. Click on Windows Update.
  4. Click the View update history option.

  1. Click the Uninstall updates option.

  1. Select the "Update for Microsoft Windows (KB4512941)" item.
  2. Click the Uninstall button.

  1. Click the Yes button.

  1. Click the Restart Now button.

Once you complete the steps, your device will go back to the more stable build 18362.295, which isn't affected by the excessive processor usage.

How to fix hight CPU usage with KB4512941 using Registry

If you're unable to remove the update or don't want to rollback, you can tweak the Registry settings to mitigate the high processor usage on Windows 10.

Warning: This is a friendly reminder that editing the Registry is risky, and it can cause irreversible damage to your installation if you don't do it correctly. It's recommended to make a full backup of your PC before proceeding.

To fix high CPU usage after installing KB4512941, use these steps:

  1. Open Start.
  2. Search for regedit and click the top result to open the Registry.
  3. Browse the following path:HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\SearchQuick tip: On Windows 10, you can now copy and paste the path in the Registry's address bar to quickly jump to the key destination.
  4. Double-click the BingSearchEnabled DWORD and set the value from 0 to 1.Important: Alternatively, users have also reported that right-clicking and deleting the "BingSearchEnabled" DWORD also fixes the problem.

  1. Click the OK button.
  2. Restart your computer.

After you complete the steps, you should no longer notice processor spikes as a result of the possible bug with update KB4512941 for Windows 10 version 1903.

Once the company permanently fixes the problem, you can revert the changes using the same instructions, but on step No. 4, make sure to set the value of the DWORD to 0.

Update September 3, 2019: Microsoft has acknowledged the problem, and it's currently investigating to address it.

Mauro Huculak is technical writer for WindowsCentral.com. His primary focus is to write comprehensive how-tos to help users get the most out of Windows 10 and its many related technologies. He has an IT background with professional certifications from Microsoft, Cisco, and CompTIA, and he's a recognized member of the Microsoft MVP community.

9 Comments
  • Thanks for posting!
  • finally, that was a painful issue :D
  • Due to the problem with the update I could not search for the program REGEDIT as mentioned in the second solution. So I used the program REGSCANNER from NIRSOFT to search for BingSearchEnabled. Double click on the result and REGEDIT will open and the setting can be changed.
    It helped me.
  • Crazy that a trillion dollar company has quality control issues.
  • Satya Nadella axed the QA department at Microsoft and Windows hasn't been reliable since then.
  • They didn't axe the QA dept, they hired many more QA testers. Too bad that these testers are paying to be one of the QA team. Oh wait, there's another name for this team: customers. As far as reliability goes, well, it goes to show the tester's compentancy levels. They should've never used the "Insiders" track to drive QA, too many incompetent contributors.
  • Thank you for the fix. After this update I was not able search anything from start menu.
    The provided registry fix works, however you don't need to reboot the computer, simply open task manager and kill SearchUI.exe process. It will immediately relaunch itself without hogging CPU.
  • Thank you for all the tips!
  • If we've done the first option, once microsoft fixes the problem, we only have to update using windows update as usual, right? I recently upgraded from W7 to W10 and still not familiar to it!