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How to Fix Windows 11 Antimalware Service Executable High CPU Usage

Updated by Daisy on Mar 10, 2022
Written by Roxanne

Workable Solutions Step-by-step Troubleshooting
1. Turn Off Windows Defender Antivirus Step 1. Press Windows + R to open the Run windows, type gpedit.msc...Full steps
2. Turn Off Real-Time Protection Step 1. Press Windows + R to open the Run dialog box and type gpedit.msc...Full steps
3. Turn Off Windows Defender via Registry Step 1. Press Windows + R to open dialog box, input regedit...Full steps
4. Reschedule Windows Defender Scheduled Scan Step 1. Press Windows Key + R to open the Run dialog box...Full steps

What is Antimalware Service Executable 

Windows has built-in antivirus software, Windows Defender. If you choose Windows Defender as your best choice. When you open Task Manager on Windows 11, you can see a background process named MsMpEng.exe or Antimalware Service Executable. If you open task manager, you can see the antimalware service executable running in a background process.

Why is Antimalware Service Executable Running High in Windows 11

If you find the antivirus program takes up a large amount of CPU, the program may be scanning your computer for malicious software in real-time. If you have updated your computer or installed large files, Windows Defender will take time to do a full scan.

How to Fix Antimalware Service Executable High Memory Usage (5 Ways)

In this part, we will list 5 ways to stop Antimalware Service Executable. Before applying these solutions, we recommend downloading another Antivirus alternative software. Otherwise, your computer is vulnerable to unexpected danger.

Read also:

1. Turn Off Windows Defender Antivirus via Group Policy Editor

Step 1. Press Windows + R to open the Run windows, type gpedit.msc and click OK or Enter key to launch Local Group Policy Editor.

Step 2. Go to Computer Configuration > Administrative Templates > Windows Components > Windows Defender or Windows Defender Antivirus

Step 3. Move to the right panel. Press Extended and you can see the option like Turn off Windows Defender Antivirus.

Step 4. Double-click it and choose Enabled as images shown. Click OK.

turn off windows defender antivirus windows 11

2. Turn Off Real-Time Protection

Step 1. Press Windows + R to open the Run dialog box and type gpedit.msc.

Step 2. On the Local Group Policy Editor, go to Computer Configuration > Administrative Templates > Windows Components > Windows Defender Antivirus > Real-Time Protection

Step 3. Double-click Turn-off real-time protection and choose Enabled.

turn off real-time protection

3. Turn Off Windows Defender via Registry (If Available)

Except for using Group Policy Editor, another choice is to start with Registry to disable Windows Defender. However, if you are not a practiced hand that understanding how harmful it is for change, we recommend you move to the next solution.

Step 1. Press Windows + R to open dialog box, input regedit and click OK to run Registry Editor.

Step 2. Follow the path: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender

Step 3. Double-click the DisableAntiSpyware, set Value data as 1, and click OK.

disable windows defender

If you find your Windows Defender Disableantispyware missing in Registry, you can create a new one as follows.

Step 1. Right-click the blank > Click New > Select DWORD (32-bit) Value from the menu > Set name as DisableAntiSpyware and click Enter

Step 2. Roll back to step 3 on the previous part.

4. Reschedule Windows Defender Scheduled Scan

Step 1. Press Windows Key + R to open the Run dialog box. Type taskschd.msc and press Enter.

Step 2. Navigate to Task Scheduler Library > Microsoft > Windows

Step 3. Expand Windows Defender, click Windows Defender Scheduled Scan, and then click Properties from the right pane.

Step 4. On the Windows Defender Scheduled Scan Properties window, move to the Security options part and uncheck Run with highest privileges.

Step 5. Click Conditions options, uncheck all search boxes under Idle, Power, and Network. Click OK.

Step 6. Open Properties again, choose the Triggers tab, and click New.

Under settings, choose the option base on your preference and click OK.

5. Add Program to Exclusion List

Step 1. Click the Windows icon on the centered toolbar.

Step 2. Navigate to Settings > Update & Security > Windows Defender

Step 3. Under the Exclusions tab, click Add an exclusion.

add to windows defender

Step 4. Scroll down to choose Exclude a .exe, .com or .scr process.

add to windows defender 1

Step 5. Type MsMpEng.exe. and click OK.

add to windows defender 2

Bonus Tip about Better PC Performance

1. How to Partition Hard Disks in Windows 11?

Using the computer, we should not only consider the protection of the computer from the virus attack but also consider whether the hard disk is healthy or not. EaseUS Partition Master is a robust disk partition software to enhance your disk performance. It features in resize/move partitions, convert MBR to GPT in Windows 11, and more.

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Windows 11/10/8/7100% Secure

[1] "Resize/Move" enables you to adjust space of a selected disk partition as wish. By "Resize/Move", you can shrink a volume, extend the other one, or create unallocated space for special use.

[2] "Clone" is for the purpose of making two identical hard disks or partitions with the same layout and content. You can use the "Clone" feature to upgrade a hard disk, replace a failing one, backup the drive data and so on.

[3] "Delete" is a common method to remove an unwanted disk partition, turning it into unallocated space.

[4] "Format" is frequently used in many situations. By formatting a drive partition, you can alter the file system, fix some corruption issues, and sometimes remove viruses and malware.

[5] "Allocate space" is very useful when one drive partition space is too much while the other is inadequate. 

[6] "Migrate OS" makes it easy to transfer a Windows installation drive to the other without reinstalling.

[7] Conversion between GPT and MBR, NTFS and FAT32, and Basic to Dynamic is getting more and more popular among EaseUS Partition Master customers. Besides all the listed benefits, there are so many functional yet practical features are waiting you to explore. 

2. How to Turn On Windows Defender in Windows 11?

If you turn off the Windows Defender and want to set it back for the data protection option, you can follow the steps.

Step 1. Click the Windows icon on the bottom screen to open Start Menu. Click Settings.

Step 2. Type Windows Security Settings in the search box.

Step 3. Go to Windows Security > Click Virus & threat protection > Under Virus & threat protection updates, click Protection updates > Scroll down to click Privacy settings and enable 4 tabs.

Step 4. Go back now and click Virus & threat protection again > Click Manage settings > Turn on Real-time protection > Click Yes

Under the Scan options part, click Full scan.

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About the Author

Updated by Daisy

Daisy is the Senior editor of the writing team for EaseUS. She has been working in EaseUS for over ten years, starting from a technical writer to a team leader of the content group. As a professional author for over 10 years, she writes a lot to help people overcome their tech troubles.

Read full bio

Written by Roxanne

Roxanne is one of the main contributors to EaseUS and has created multiple posts on digital devices like PCs, Mobile phones, tablets, Mac, etc. She loves to share ideas with people of the same interest.

Read full bio

Product Reviews

Product Reviews

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  • I love that the changes you make with EaseUS Partition Master Free aren't immediately applied to the disks. It makes it way easier to play out what will happen after you've made all the changes. I also think the overall look and feel of EaseUS Partition Master Free makes whatever you're doing with your computer's partitions easy.

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  • Partition Master Free can Resize, Move, Merge, Migrate, and Copy disks or partitions; convert to local, change label, defragment, check and explore partition; and much more. A premium upgrade adds free tech support and the ability to resize dynamic volumes.

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  • It won't hot image your drives or align them, but since it's coupled with a partition manager, it allows you do perform many tasks at once, instead of just cloning drives. You can move partitions around, resize them, defragment, and more, along with the other tools you'd expect from a cloning tool.

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