Antimalware Service Executable (MsMpEng.exe) High CPU usage

Antimalware Service Executable (MsMpEng.exe) High CPU usage On Windows 10. Let's understand, what is Antimalware Service Executable? Why Antimalware Service Executable causing 100% CPU, Disk, Memory usage on Windows 10

Did you find Windows 10 High CPU usage after installing the latest Windows update? The system became unresponsive, suddenly antimalware service executable takes all disk, memory, and CPU too high up to 100% every minute. Let’s understand, what is Antimalware Service Executable. Why it’s running in the background and causing High CPU usage, 100% Disk, and Memory usage on Windows 10?

What is Antimalware Service Executable?

Antimalware Service Executable is a Windows background process that is used by Windows Defender. It’s also known as MsMpEng.exe, that first introduced in Windows 7 and has been around since then in Windows 8, 8.1, and Windows 10. Antimalware Service Executable is responsible for scanning all files on the computer, detecting any dangerous software, installing antivirus definition updates, etc. This process allows Windows Defender to continuously monitor your computer for potential threats and provide real-time protection against malware and cyber-attacks.

For example, when you plug in a USB flash drive or an external hard drive, it will monitor those devices for threats. If it finds something that it suspects, it will isolate or eliminate it immediately.

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Why Antimalware Service Executable High CPU usage?

The most common reason for Antimalware Service Executable High CPU Usage is the real-time feature which is constantly scanning files, connections, and other related applications in real-time, which is what it is supposed to be doing (Protect In Real Time). Another reason for High CPU, Memory and Disk usage or the system became unresponsive is its Full Scan, which performs a comprehensive check of all files on your computer. Also sometimes corrupted system files, Disk drive failure, Virus malware infections or any Windows service stuck running on the background also cause High CPU usage on Windows 10.

Should I disable Antimalware Service Executable?

We did not recommend disable Antimalware Service Executable As this protect your system from ransomware attack which can lock down your files. However, if you feel like it’s taking too many of resources, you can turn off the real-time protection.

  • To do this open Windows 10 Settings using Windows key + I
  • Go to Update & Security then Windows security
  • Click on Virus & threat protection then Virus & threat protection settings and disable Real-time protection.
  • It will automatically enable it when it doesn’t find any Antivirus software installed on your PC.

Turn off Real-time protection

Turn Off All Scheduled Tasks Of Windows Defender

In several cases, this high usage issue occurs because Windows Defender continuously runs scans, which are managed by scheduled tasks. Fortunately, you can turn them off manually by changing a few options in Windows Task Scheduler.

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  • Press Windows + R, type taskschd.msc, and ok to open the Task Scheduler window.
  • Here nevigate Task Scheduler (Local) -> Task Scheduler Library -> Microsoft -> Windows -> Windows Defender
  • Find a task named “Windows Defender Scheduled Scan” and double-click on it to open the Properties window.
  • First Uncheck Run with the highest privilegesNow switch to the Conditions tab and uncheck all four options, Then click OK.

Turn Off All Scheduled Tasks Of Windows Defender

Prevent Windows Defender From Scanning Itself

If you right-click on Antimalware Service Executable and choose the “Open file location” option, it will show you a file named MsMpEng.exe, located C:\Program Files\Windows Defender. And sometimes Windows Defender starts scanning this file which causes a high CPU usage issue. Therefore, you can add MsMpEng.exe to the “Excluded files and locations” list to prevent Windows Defender from scanning this file, which will help to prevent high computer resource usage issues from occurring.

  • To do this, Open settings, Update & Security -> Windows security.
  • Click on Virus & threat protection, then on Virus & threat protection settings.

Virus & threat protection settings

  • Scroll down until “Exclusions” and click Add or Remove exclusions.
  • In the next screen, click on Add an Exclusion, select Folder, and paste the path to Antimalware Service Executable (MsMpEng.exe) in the address bar.
  • Finally, click Open and the folder will now be excluded from the scan. Restart your PC and see if the issue persists.

exclude windows defender scanning

Turn Off Windows Defender With Registry Editor

Still, the problem is not resolved. Is Antimalware Service Executable continuously causing high CPU usage on Windows 10? Let’s Disable Windows Defender protection by performing the registry tweaks below.

Note: Keep in mind that doing so leaves you vulnerable to a range of cyberattacks, so it’s critical that you install an effective anti-malware product on your computer before removing Windows Defender.

Press Windows Key + R, type Regedit, and ok to open the Windows registry editor, First backup the registry database, then navigate to

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender.

Note: If you do not see a registry entry named DisableAntiSpyware, right-click in the main Registry Editor pane and select New > DWORD (32 bit) Value. Name this new registry entry DisableAntiSpyware. Double click it and set its value data to 1.

Turn Off Windows Defender With Registry Editor

Now close the registry editor and restart Windows to take effect the changes. Check on the next login there is no more high CPU usage, and 100% disk usage by Antimalware Service Executable.

Note: After turning off Windows Defender, you need to find a good antivirus or anti-malware program to install on your Windows computer to protect it from harmful apps.

Also sometimes corrupted system files cause high System resource usage or popup different errors on Windows 10. We recommend running system file checker utility that scans and restores missing corrupted system files.

Also, perform clean boot to check and make sure any third-party application not causing 100% CPU usage on Windows 10.

Did these solutions help to fix High CPU usage, 100% disk, and memory usage by  Antimalware Service Executable process on Windows 10? let us know which option worked for you, Also Read

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