Avast Service and high CPU

[aussiestefano]

I have the latest version of Avast Premium Security and I have a problem with Avast Service using a lot of CPU. I already tried a few solutions but every time I open a few tabs Avast service use more than 50% of CPU slowing my PC a lot. Is it a normal thing and if not what I can do to fix it? Thanks .

[Asyn]

- Which version/build of Avast Premium..?
- OS..? (32/64 Bit..? - which SP/Build..?)
- Other security related software installed..?
- Which AV(s) did you use before Avast..?

[aussiestefano]

22.6.2022
Windows 10 64bit
no other or previous antiviruses
at the moment I'm doing nothing and avast service is using 45% of CPU

[Asyn]

Repair Avast:
1. Avast GUI -> Settings -> Troubleshooting
2. Click on 'REPAIR APP'.
3. Follow instructions.
4. Reboot.

[aussiestefano]

worse than ever. I open a few tabs and avast uses 70-75% of cpu

[Asyn]

1. Download Avast Premium Security: https://files.avast.com/iavs9x/avast_premium_security_setup_offline.exe
2. Follow instructions: https://www.avast.com/uninstall-utility (Run this tool for all prior installed Avast versions..!!)
3. Reinstall Avast with the downloaded installer from point 1.
4. Reboot.

[aussiestefano]

Now it works well, thank you very much!

[Asyn]

You're welcome.

[rnathan]

I run Windows 10 Home and Avast Premium Security. Up to the end of June my CPU usage was showing at/near 100%, with Software Analyzer, Windows Explorer and several system tasks like scheduler contributing. Right clicking the Avast ball -> Update and a rather slow Restart gave me version 22.6.6022 (build 22.6.7355.731), and the problem has disappeared.

Best regards, Roger N.

[Stefano16]

I honestly don't know what do do with this antivirus, it uses so much CPU that I can't do anything else, every couple of days i do the uninstall/reinstall trick and then it's good but in 3-4 days it's at that level again.  My system is Windows 10 64bit, does this happen to others and what I can do about it?

[DavidR]

Can you attach a screenshot of the Task Manager when this occurs  ?

Some information in your system could be helpful.
What CPU, is this occurring when doing something specific, because Avast is generally low resources.
See my signature below my post/s to see what my old windows10 laptop specs are, and I don't experience this.

[Stefano16]

It happens when I open a few tabs at the same time. I tried with Firefox and then Chrome and when I open 9-10 tabs I have immediately the CPU close to 100% with Avast service that uses 75-80%

[DavidR]

Firefox is my default browser and I don't see this, currently have 11 tabs open and this is about normal for me and resources use is low see screenshot.

This is pretty much why I asked if you could post a screenshot and about your system.

[frankey999]

Hi,
I'm having the same problem.
I rebooted a couple days ago and suddenly I hover between 20-50% CPU.  If I do anything in my browser, click anything in any website, CPU goes to 100% as long as the browser activity continues.

Using Win7, 64 bit.  No other anti-virus.  Using Firefox, latest.  I also have Avast 22.8.6030.  No idea how I got this version.  I see from another post that 22.7 is the latest version.

I check Task Manager, Resource Monitor, and it says AvastSvc.exe is using 40% average CPU while not doing anything.

edit: forgot to mention I can't even login to this board with the computer, it keeps saying "a glitch in the matrix".  Needed to login using a 2nd computer.

[DavidR]

The latest is 22.8 - https://forum.avast.com/index.php?topic=320917.0

As I mentioned in my reply to Stefano16 a screenshot would help try to determine what is getting involved.
As you can see from my screenshot I'm not experiencing this, so it would be a good comparison.