What is SystemExtr? What triggers SystemExtr issue on the Mac? Why is your CPU showing high CPU or power consumption? What does it mean or how it affects the performance of your Mac? How To fix SystemExtr Mac error?

What is SystemExtr?

The SystemExtr error showing high CPU usage may occur due to various possible reasons. Most of the time, it may occur due to the presence of any adware or PUA that is triggering the issue.

Some unwanted programs are meant to run silently within the system using high system resources. Thus, if you try to run any heavy application then you may start noticing errors stating the “SystemExtr quit unexpectedly” and so.

In such a case, the issue can be simply related to some unwanted program that may have installed accidentally along with software bundles.

Other reasons, may be due to any corrupt system files, apps crashing frequently, any hardware related issue or bloatware present on your Mac.

Often times, Mac users may start experiencing such issue after updating latest version of Mac OS. This often happens when the update is conflicting with some existing settings or apps.

What triggers SystemExtr issue on the Mac?

As mentioned above, there can be various possible reasons behind getting SystemExtr error on your Mac. However,  it is important to give a look on all the possible reasons behind this.

SystemExtr Quit Unexpectedly

SystemExtr Quit Unexpectedly 

The very first thing, you should check for the presence of any potentially unwanted program. As such this may suddenly start taking up huge CPU resources. Also, there can be crypto-miners that usually takes up most of the CPU resources of the device to silently mine the crypto-currency. Such programs does not show any visible symptoms. However, due to system running out of resources, you can expect to get errors that may cause your apps or system to quit unexpectedly.

  1. Various unwanted Applications or Process running
  2. Outdated Mac OS
  3. Presence of any Potentially unwanted program or malware
  4. Unknown extensions added to the browser
  5. Insufficient Memory
  6. Lots of unnecessary files, programs leftovers, preferences files or cache

These may be the possible issues of getting SystemExtr error or CPU showing high usage. So, in this guide we will try to fix SystemExtr Mac error, with possible solution for all above mentioned issues.

How To Fix SystemExtr Consuming Huge CPU Issue On Mac?

Its very obvious to get worried of what causing the system to quit applications unexpectedly or others errors. So, this guide will help you to fix SystemExtr Mac error consuming huge CPU issue on Mac.

  • View CPU Usage in Activity Monitor

Firstly, you should check for the background applications or processes taking up high CPU usage. For this, you need to check the Activity Monitor.

To check apps usage under Activity Monitor: 

  1. Go to Finder –> Applications –> Utilities –> double click to launch the Activity Monitor.
  2. Once the Activity Monitor window opens, you can see various process, click the one taking up high CPU;
  3. For this, navigate to Memory, to load the graph.

If you see unwanted apps taking up high CPU and memory, then you can either delete the apps or force quit the process consuming memory. You can also free up your memory to avoid overloading the RAM.

  • Force Quit Unwanted Applications

Force Quit can also help when an app gets struck or unable to close normally.

  1. To open the “Force Quit” window, press Option+Command + Esc (Escape) keys on the keyboard all together. Else In the top-left corner of your screen, open the Apple menu and choose the “Force Quit” option.
  2. Now select the application you want to quit from the open window.
  3. Click Force Quit.

Now, the application is no longer running in the background.

  • Remove Adware, PUA or other unwanted Applications

After, quitting unwanted applications, it is important to remove unwanted applications, that may have accidently installed. You should try looking for apps, which you have downloaded before started getting the SystemExtr error on your Mac.

So, here is the quick way to delete applications on Mac.

  1. Open “Launchpad” on your dock.
  2. Click and hold the application to want to delete;
  3. An “X” will appear on the top-right of the app. Click on “X” to trash the app. Or drag and drop the application’s icon to the trash.
  4. After that, “Empty Trash” to permanently get rid of unwanted applications.


  1. Open Finder;
  2. Click on “Applications” within the sidebar;
  3. Next, find the application you want to remove.
  4. Choose the “Move to Trash” option.
  5. Empty Trash.

Repeat, the steps to find and delete all such adware, or unnecessary applications.

  • Remove library files, leftovers and preferences files

Whether, it is Windows or Mac or even other OS, all stores various files associated with the applications, updates, permissions and others. So, even if you delete any program, they leave some their files, cache, logs and library files. So, to free up your memory and remove the clutter of unnecessary files or cache. You need to either manually remove them or the best way to do is run an effective software tool to do so safely.

To Remove App Preferences files manually, follow the steps below:

  1. On Top-menu of Apple, choose “GO” and select “Library” from drop-down list;
  2. Open Preferences Folder from there;
  3. There will be lots of files named as “com.company-name.application-name.plist”. You need to find all such files with your application name.
  4. Drag and drop all such files to trash; (Repeat for all). Close the Window
  5. On the dock, on the Trash icon, right-click on it and click on “Empty Trash“.
  6. This will remove all .plist files related to the application.


You can go to following folders via “Go To Folder” to access Application SupportLaunchAgents, and LaunchDaemons and search and delete unwanted files of the apps you removed.

  1. Select Go –> Go to Folder.
  2. Next, enter “/Library/Application Support” and hit Enter.
  3. Within the Application Support folder, search for unwanted program entries related to unknown programs or SystemExtr related application.
  4. Now again, do the same for other folders- /Library/LaunchAgents and /Library/LaunchDaemons and delete the files.

If the application won’t allow you to remove preferences files, or you don’t find the app within the Application folder. It means it is a potentially unwanted application.

Although, it’s a tricky process and takes a lot of time to manually remove them or better to reset the Mac to its default settings.

To ease it out, you can just download ComboCleaner, to follow the above steps in one click. 

Remove SystemExtr error on your Mac Using ComboCleaner

ComboCleaner has various features like App uninstaller, Cleaning unnecessary files, clearing browsing data, and restoring all default settings. Apart from that, it is an award-winning anti-malware tool that scans your Mac for any kind of threats, vulnerabilities and risks. Check out Full review and installation guide. 

You can perform all the above steps in just 3 steps:

Combo Cleaners LogoCombo Cleaner DOWNLOAD LINK
(The above link will open a new page from where the Combo Cleaner will download)
    • Download the app;
    • Install it;
    • Launch the app and sit, relax and let ComboCleaner do it all for you.combo cleaner antivirus scan

Combocleaner will run the scan to find the errors, will report any unwanted application and also optimize the Mac.

  • Uninstall Unknown or Fake Extensions From Browsers

Most of the times, adware and PUA targets the browsers, and disguises as browser extensions, add-ons or toolbars. These may run in the background to inject malicious ads, scripts and redirects that may create trouble and cause unexpected errors.

So, it is better to check to unknown or other extensions which you do not need any more:

To remove extensions from Safari Browser: 

  1. On the Safari browser, click the “Safari” menu then select “Preferences”.
  2. On Preferences tab and navigate to Extensions.
  3. The “Extensions” screen will list all the extensions installed on your safari browser. You need to browse through the list and uninstall SystemExtr or other related extension or Adware.
  4. Select it and then click on “Uninstall”. Repeat the steps to remove all unwanted extensions.

To remove extensions from Chrome Browser: 

  1. Click on the main menu, on top-right corner;
  2. Now, click on “More tools” and then choose Extensions;
  3. This will list all the extensions installed Chrome extensions.
  4. Here, you need to check for any suspicious extension, if found click on it;
  5. Click Remove.

To remove extensions from Firefox Browser

  1. Click the main menu of the Firefox browser;
  2. Next choose Add-ons to launch the Add-ons Manager tab.
  3. Click on Extensions Tab;
  4. Now, choose the extensions or add-ons to want to delete;
  5. Click the Disable button to remove it.

Now, that your browser is free from any kind of adware or unnecessary extensions.

  • Check For Software Updates.

you should check for the latest software updates. This is again an important thing users must do to avoid such errors. As often times, there are apps compatibility issues due to older version, and patch any bug or system related errors.

To check for the latest updates of your software:

  1. Visit the App Store;
  2. Go to Updates;
  3. Check for the apps that needs an update;
  4. Click on the Update button next to the application.

Repeat this for all the apps the needs an update.

  • Reboot Your Mac

After updating the applications, it is important and even advised to reboot the OS to make things settle down. it also helps the system to resolve the issues.

To reboot the Mac, follow the steps:

  1. Click on the Apple menu on top of your screen.
  2. Then click Restart.
  3. This will allow the Mac to close the applications running in the background and restart the computer.

For force restart: press the ctrl + command along with pressing the power button.

After restarting the Mac, it is recommended to scan your device to make sure it is free of any kind of adware, virus or unwanted program triggering the SystemExtr error. 

To fix SystemExtr Mac error and check if your Mac is infected- ∇ Download ComboCleaner

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