Fix Windows 10 Antimalware Service Executable(MsMpEng) High CPU Usage [Solved]

Antimalware Service Executable is the background process MsMpEng (MsMpEng.exe)  run by Windows Defender. It can protect your PC from malware. But more and more user reported that it caused high cpu usage. That’s a real annoying error as it makes your PC run slowly. Luckily, we’ve got the answer for you. Go on with the effective fixes below.

1. Change Windows Defender’s schedule
2. Add Antimalware Service Executable to Windows Defender exclusion list

Fix one: Change Windows Defender’s schedule

The error is mainly due to its real-time protection feature. Thus we can change Windows Defender’s schedule to fix it.

Press Windows logo key + R key at the same time to open Run dialog box. 
Then type taskschd.msc in the box and hit Enter.

Double-click on Task Scheduler Library Microsoft Windows.

Scroll down to find and double-click on Windows Defender under Windows dialog.
Then double-click on Windows Defender Scheduled Scan in the middle pane.

On General pane of pop-up window, uncheck Run with highest privileges.

Then click Conditions pane, uncheck all the items in this pane.
Click OK.

With the steps above, your error should be fixed now.
If unfortunately it didn’t serve you, make sure to try another fix below.

Fix two: Add Antimalware Service Executable to Windows Defender exclusion list

Press Windows logo key + key at the same time to open Windows Setting.
Then scroll down to choose Update & security.

Click Windows Defender on the left pane.
Then scroll down to click Add an exclusion under Exclusions dialog.

Scroll down to click Exclude a .exe, .com or .scr process

On the pop-up window, type MsMpEng.exe in the box.
Then click OK.

Now you have added Antimalware Service Executable to Windows Defender exclusion list. The error should be fixed by now.

Hopefully the fixes can help you solve the problem.
Any question just leave a comment below.


April Cai, in Technical Tips Tags: Task ManagerWindows 10
  • hannoverfisst

    Microsoft claims this has minimal impact on CPU performance, but whenever I check the task manager, Windows Defender was always using 6-8% cpu and the Antimalware Service Executable was using another 6-8% cpu. I did not really see any program impact however my mouse pointer would change to the spinning busy icon for about 1 second every 2-3 seconds and that alone was very annoying! This fix seems to have resolved that though. Thanks much!!

  • Matt

    Fix 1 = could not uncheck “run at highest priority” in step 4
    Fix 2 = worked! Many Thanks