Author Topic: avastui.exe high cpu usage  (Read 3854 times)

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avastui.exe high cpu usage
« on: August 13, 2017, 05:01:53 PM »
Hi,

I've an Avast Internet Security 17.5.2303 on a Windows 7 Ultimate desktop.
After the last upgrade the UI came very sensitive.  If I scan something (file, folder etc.) the process avastui.exe will take almost all of cpu. The Sysinternals Process Explorer shows that threads by start address ucrtbase.DLL!_crt_at_quick_exit+0xb0 shares the cpu load.

If I open Protection / Antivirus I'll get "Loading" on that tab an a thread.  Also the Result / Details button has same function.

Logging off and in again helps but that's not very convenient;)

- Esa H.

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Re: avastui.exe high cpu usage
« Reply #1 on: August 13, 2017, 05:38:15 PM »
- Other security related software installed..?
- Which AV(s) did you use before Avast..?
W8.1 [x64] - Avast PremSec 22.7.7366.BC [UI.713] - Firefox ESR 91.11 [NS/uBO/PB] - Thunderbird 91.11
Avast-Tools: Secure Browser 103.0 - Cleanup 22.2 - SecureLine 5.18 - DriverUpdater 22.2 - CCleaner 6.01
Avast Wissenswertes (Downloads, Anleitungen & Infos): https://forum.avast.com/index.php?topic=60523.0

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Re: avastui.exe high cpu usage
« Reply #2 on: August 13, 2017, 05:47:44 PM »
Try the following: Repair Avast:
Control Panel> Program and Features (Add/remove program)>Select Avast> Select Repair. Reboot when completed
https://www.avast.com/faq.php?article=AVKB204


If Repair doesn't fix the problem, try the following:
Clean Install of Avast:
https://goo.gl/4Ptzkf
If you need additional help with the Clean Install, watch this:
https://youtu.be/p-h3myRD51A
Free avast! Security Seminar: http://bit.ly/2N1eaR2  -  Important: http://www.organdonor.gov/ -- My Web Site: http://bob3160.strikingly.com/ - Win 11 Pro v21H2 64bit, 16 Gig Ram, 1TB SSD, Avast Free 22.5, How to Successfully Install Avast http://goo.gl/VLXdeRepair & Clean Install https://goo.gl/t7aJGq -- My Online Activity https://

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Re: avastui.exe high cpu usage
« Reply #3 on: August 13, 2017, 11:43:56 PM »
A W7 Home Premium laptop had the same issue.

- Other security related software installed..?
- Which AV(s) did you use before Avast..?
Avast has been the only AV-software on these computers from the initial install for 7 years.

Try the following: Repair Avast:
Control Panel> Program and Features (Add/remove program)>Select Avast> Select Repair. Reboot when completed
https://www.avast.com/faq.php?article=AVKB204

If Repair doesn't fix the problem, try the following:
Clean Install of Avast:
https://goo.gl/4Ptzkf
If you need additional help with the Clean Install, watch this:
https://youtu.be/p-h3myRD51A

Repairing made no difference in my case.

I prepared for clean install by taking screen shots of some log screens (e.g. Virus Chest).
The Clean Install of Avast solved the problem on both computers.

Thank you for your help!

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Re: avastui.exe high cpu usage
« Reply #4 on: August 13, 2017, 11:51:36 PM »
You're welcome. :)
Free avast! Security Seminar: http://bit.ly/2N1eaR2  -  Important: http://www.organdonor.gov/ -- My Web Site: http://bob3160.strikingly.com/ - Win 11 Pro v21H2 64bit, 16 Gig Ram, 1TB SSD, Avast Free 22.5, How to Successfully Install Avast http://goo.gl/VLXdeRepair & Clean Install https://goo.gl/t7aJGq -- My Online Activity https://