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Mrt High Cpu

How to Fix MRT High CPU Usage on Mac

MRT (Malware Removal Tool) is a built-in feature of macOS that scans your Mac for malware and removes it. It runs automatically in the background and usually does not cause any problems. However, some users have reported that MRT causes high CPU usage on their Macs, slowing down their performance and draining their battery life.

mrt high cpu

In this article, we will show you how to fix MRT high CPU usage on Mac. We will also explain what MRT is, why it causes high CPU usage, and how to prevent it from happening again.

What is MRT and Why Does it Cause High CPU Usage?

MRT stands for Malware Removal Tool. It is a part of the XProtect system that Apple uses to protect your Mac from malware. XProtect is a database of known malware signatures that is updated regularly by Apple. MRT is the tool that scans your Mac for these signatures and removes any malware it finds.

MRT runs in the background and does not have a user interface. You can see it in the Activity Monitor app as "mrt". It usually runs when you start up your Mac, install a software update, or download a file from the internet. It should not take more than a few minutes to complete its scan and then stop running.

However, sometimes MRT can get stuck in a loop or encounter a bug that causes it to run continuously and consume a lot of CPU resources. This can slow down your Mac and make it overheat and noisy. It can also drain your battery life quickly.

How to Fix MRT High CPU Usage on Mac

If you notice that MRT is causing high CPU usage on your Mac, you can try the following methods to fix it:

  • Force quit MRT. You can do this by opening the Activity Monitor app, finding "mrt" in the list of processes, selecting it, and clicking on the "X" button in the top left corner. Then click on "Force Quit" to confirm.

  • Restart your Mac. Sometimes a simple restart can fix the problem and make MRT run normally again.

  • Update your macOS. Apple may have released a fix for the MRT issue in the latest version of macOS. You can check for updates by going to the Apple menu > System Preferences > Software Update and following the instructions on the screen.

  • Delete the MRT app. If none of the above methods work, you can try deleting the MRT app from your Mac. However, this is not recommended as it may compromise your security and expose you to malware. To delete the MRT app, you need to disable System Integrity Protection (SIP) first. SIP is a feature that prevents unauthorized changes to system files and folders. To disable SIP, you need to boot your Mac into Recovery Mode by holding down Command + R while restarting your Mac. Then go to Utilities > Terminal and type "csrutil disable" and press Enter. Then restart your Mac normally and go to /System/Library/CoreServices/ folder and find "". Drag it to the Trash and empty it. Then enable SIP again by repeating the same steps but typing "csrutil enable" instead.

How to Prevent MRT High CPU Usage from Happening Again

To prevent MRT high CPU usage from happening again, you can follow these tips:

  • Keep your macOS updated. Apple may release patches or updates for MRT that fix any bugs or issues that cause high CPU usage.

  • Avoid downloading files from untrusted sources. Some files may contain malware that triggers MRT to run excessively.

  • Use a reliable antivirus software. Although MRT is a useful tool for removing malware, it is not a substitute for a full-fledged antivirus software. A good antivirus software can detect and prevent malware infections before they reach your Mac and cause problems.


MRT high CPU usage on Mac is a common problem that can affect your performance and battery life. You can fix it by force quitting MRT, restarting your Mac, updating your macOS, or deleting the MRT app. You can also prevent it from happening again by keeping your macOS updated, avoiding untrusted downloads, and using a good antivirus software. 06063cd7f5

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