How to Fix ‘Antimalware Service Executable’ High Memory, CPU, or Disk Usage in Windows 11

Are you noticing your Windows 11 computer running slower than usual, with high CPU, memory, or disk usage? Upon checking the Task Manager, you might find a process named Antimalware Service Executable consuming significant system resources. In this guide, we’ll explore effective methods to reduce the resource consumption caused by this process without compromising your system’s security.

What is ‘Antimalware Service Executable’?

The Antimalware Service Executable is a core component of Windows Defender, the built-in antivirus program in Windows 11. This process runs in the background, providing real-time protection by scanning for malware and viruses. If you don’t have a third-party antivirus installed, Windows Defender is essential to safeguard your system.

While Windows Defender is crucial for security, sometimes the Antimalware Service Executable can consume excessive system resources, leading to performance issues. If you’re facing this problem, here are some methods to mitigate the high resource usage.

Method 1: Change the Windows Defender Task Schedule

Adjusting the scan schedule of Windows Defender can help reduce its impact on system performance during active hours. By scheduling scans at times when you’re less likely to use your computer, you can minimize high resource usage.

Open the Start Menu and type Task Scheduler in the search bar. Then, click on the Task Scheduler app from the search results.

In the Task Scheduler window, navigate to the left pane and expand Task Scheduler Library. Then, double-click on Microsoft and select Windows.

Scroll through the list and locate the Windows Defender folder. Click on it to view its tasks in the center pane.

In the center pane, right-click on the task named Windows Defender Scheduled Scan and select Properties from the context menu.

In the Properties window, switch to the Triggers tab and click on New to create a new trigger.

In the New Trigger window, set the task to begin On a schedule. Choose the Weekly option, select a day and time when your computer is typically idle, and click OK to save the new trigger.

Back in the Triggers tab, select any existing triggers that you did not create and click Delete to remove them. This ensures that scans only occur at the scheduled times you’ve set.

By adjusting the scan schedule, Windows Defender will perform scans during off-peak hours, reducing high resource consumption while you’re using your computer.

Method 2: Turn Off Real-Time Protection in Windows Defender

Disabling Real-Time Protection can significantly reduce resource usage, but it also decreases your system’s security. Use this method cautiously, especially if you don’t have another antivirus solution installed.

Open the Start Menu, type Windows Security, and select the Windows Security app from the search results.

In the Windows Security window, click on Virus & threat protection from the left pane.

Under the Virus & threat protection settings, click on Manage settings.

Find the Real-time protection toggle and switch it to Off. If prompted, confirm the action to turn off real-time scanning.

With Real-Time Protection disabled, Windows Defender will no longer continuously monitor your system, which can reduce high CPU and memory usage. However, make sure you have another antivirus solution in place to keep your system protected.

Method 3: Stop the Windows Defender Service

Stopping the Windows Defender service can free up system resources. This method should only be used if you have another antivirus program installed, as it turns off essential security features.

Open the Start Menu, type Services, and select the Services app from the search results.

In the Services window, scroll down to find Windows Defender Antivirus Service. Right-click on it and choose Stop from the context menu.

This will temporarily stop the Windows Defender service. Keep in mind that Windows may restart this service automatically after a while or upon reboot. To prevent it from restarting, you would need to disable it permanently, which is not recommended unless you have a reliable alternative in place.

Method 4: Disable Windows Defender Using the Registry Editor

For a more permanent solution, you can disable Windows Defender through the Registry Editor. This method should be used with caution, as modifying the registry can have unintended consequences. Make sure to back up your registry before proceeding.

Open the Start Menu, type Registry Editor, and click on the Registry Editor app from the search results.

In the Registry Editor, navigate to the following path by copying and pasting it into the address bar and pressing Enter:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender

In the left pane, right-click on the Windows Defender key, hover over New, and select DWORD (32-bit) Value.

Rename the new value to DisableAntiSpyware and press Enter to save the name.

Double-click on DisableAntiSpyware, set the Value data to 1, and click OK.

Close the Registry Editor and restart your computer to apply the changes.

After restarting, Windows Defender should be disabled, and the Antimalware Service Executable process should no longer consume system resources. Remember, disabling Windows Defender leaves your system vulnerable unless you have another antivirus installed.

By following these methods, you can effectively reduce the high CPU, memory, or disk usage caused by the Antimalware Service Executable process on your Windows 11 computer. Always ensure your system remains protected by using a reliable antivirus solution if you choose to disable Windows Defender.