FIX: Avast high CPU usage

Radu Tyrsina
by Radu Tyrsina
CEO & Founder
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Affiliate Disclosure

  • Avast is a free antivirus tool that anyone can download from the Internet.
  • Unfortunately like all other antivirus tools, it constantly runs in the background, and this can take up some of your PC's CPU.
  • We have plenty of similar articles covered in our dedicated hub for troubleshooting CPU issues, so make sure to visit that as well. 
  • For more great articles, check out our Antivirus page.
avast high cpu

First of all, Avast high CPU usage should be normal because the program is in no way a lite one. However, sometimes, it can be problematic because you get an error saying Avast service 32 bit high CPU even when Avast is idle.

Don’t uninstall Avast just yet before troubleshooting it with these solutions.

How do I lower Avast high CPU usage?

1. Uninstall the Avast Cleanup tool

  1. Launch Avast on your computer.
  2. In the Avast interface, click Menu and open Settings.
  3. Next, navigate to Components on the left sidebar.
  4. Next, to remove Avast Cleanup, click on the downward-facing arrow beside the Components tab and hit uninstall component.
  5. After that, confirm the operation by clicking on the OK button at the bottom of the page.
  6. Finally, restart your computer.

When you successfully uninstall the Avast Cleanup tool, you should no longer get the Avast.exe high CPU problem. Otherwise, continue to the next solution.

2. Update Avast

  1. Open Avast on your computer.
  2. Next, click on Settings and select Menu from the dropdown list.
  3. In the menu, navigate to the General tab and choose Update to the right of the page.
  4. Now, what you want to do here is update the database, as well as Avast itself. On this page are two Check for Updates buttons for updating both.check-for-updates-avast-high-cpu-usage
  5. If the virus definitions or application is not up to date, begin the update, and on completion, the update should clear the avastsvc.exe high CPU usage error.

3. Fix Avast service high CPU by editing avast5.ini

  1. Open the File Exporer and go to your C: directory.
  2. Next, navigate to the following location C:ProgramDataAvastSoftwareAvast. This takes you to the Avast folder.
  3. Next, from the Avast folder, open the file called avast5.ini and add the following line to the end of the file:
    • [GrimeFighter] : ScanFrequency=999 edit-avast-file-avastsvc.exe-high-cpu
  4. Finally, save the avast5.ini file and then reboot your machine.

4. Repair the Avast program

  1. Tap on the Windows key to open the Start menu.
  2. Here, search for Control Panel and launch it from the results.
  3. Switch to the Category view of Control Panel by selecting it from the top right-hand corner, and then select Uninstall a Program in the Programs category.
  4. Scroll down this list and locate Avast. Right-click on the Avast program and hit
  5. Next, you will see the Avast uninstallation wizard screen showing three options – UpdateRepair, and  Modify. Select Repair and hit Next.
  6. Follow through with the wizard, and at the end, Avast will restart with the Avast high CPU usage fixed.

5. Stop Avast Screensaver Scanning

  1. On your computer, get any file at all and right-click on it. Next, from the options, click Scan selected items for viruses to scan this file with Avast.scan-for-virus-avast-high-cpu-usage
  2. On selecting to scan the file, Avast will display the result of the process after a while. Here also, you will see the results of other running scan operations.
  3. Next, look for the Avast Screensaver scan and then hit Stop to end the process.

When the Avast service 32 bit high CPU error occurs, it hampers the performance of your PC and can cause overheating or similar issues.

Hopefully, the solutions on this page have helped you lower the Avast high CPU usage. Did it work? Let us know in the comments below.

FAQ: Learn more about Avast! Antivirus

  • Is Avast a good antivirus?

Avast has been noted as being one of the best antivirus tools in the world, garnering praise throughout its years of existence. That is why it is one of the antivirus tools that we recommend the most.

  • Is Avast completely free?

Avast is completely free, although it does offer certain Freemium options to those that pay.

  • How does Avast make money?

Avast makes most of its revenue from the Freemium model that it practices, although the core functions are completely free. Of course, there are plenty of other antivirus tools that also offer free subscription models.