Author Topic: Avast freezes/lags my google chrome  (Read 10926 times)

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Offline Pierogi

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Avast freezes/lags my google chrome
« on: January 06, 2021, 11:19:47 AM »
Hello. Since yesterday Avast AV started to make my Google Chrome lag/freeze when i do things on it, no matter what. For example when i go to YouTube and try to choose a video from main page, whole browser freezes for a few seconds, 2-4. When the video finally gets launched and i want, for example, to change it's quality by clicking the 'gear' option, it also freezes for few seconds. Same when i search for something on google. Happens with many things i do on Chrome. When i disable every Avast shield, everything is back to normal, no freezes, no lags, everything works fast as before. It started happening yesterday after i restarted my PC, before that everything was working fine. My AV was outdated since 2-3 months, so i updated it to newest version, but it didn't solve the problem. Anyone could give me some advice about it? It really bothers me.

Edit:
I did "repair", but it didn't solve the problem.

I also did check again which protection causes it and it looks like only "Web shield" is causing these freezes. When i turn it off, freezes are gone, but with it enabled i have them.

Edit 2:
Seems like disabling "QUIC/HTTP3" scanning gets rid of the problem in "Web shield" column in settings.
« Last Edit: January 06, 2021, 01:45:13 PM by Pierogi »

Offline bob3160

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Re: Avast freezes/lags my google chrome
« Reply #1 on: January 06, 2021, 04:09:53 PM »
I've reported this to the developers let's see if that gets us an answer.
I'm not having that problem.
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Offline steveb980

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Re: Avast freezes/lags my google chrome
« Reply #2 on: January 06, 2021, 06:40:13 PM »
I have the same issue! Entire day!

Yesterday there was an update for Avast. It required restart. I just turned off my PC.
Today when I turned it on and started browsing I could immediately feel everything was sluggish and there were often computer hangs.

Some hangs last for few seconds.

Of course I was in panic mode and started to check everything. Because this is unacceptable.
After few hours of troubleshooting everything I found it. It is Avast Web Shield!

It happens when I try to load some pages or when I try to interact on some of the pages.
It happened even when I tried to register on this forum! 5 seconds complete computer hang.

What to do!?
I am aware Web Shield is the most important module and just disabling it will bring more issues.

If I disable QUIC/HTTP3 scans, I guess I need to disable those protocols in Chrome too, right?

Please fix! I would hate if I need to find different AV solution because of this.

I've reported this to the developers let's see if that gets us an answer.
I'm not having that problem.

Any news?

Offline Pierogi

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Re: Avast freezes/lags my google chrome
« Reply #3 on: January 06, 2021, 06:44:29 PM »
If I disable QUIC/HTTP3 scans, I guess I need to disable those protocols in Chrome too, right?

I didn't touch anything in Chrome settings, i only disabled QUIC/HTTP3 scanner in Avast in "Web shield" column and it solved the problem with freezes. Yet still i wouldn't like to have it disabled, so i'm waiting for the solution/fix for it as well.

Offline Michal Z.

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Re: Avast freezes/lags my google chrome
« Reply #4 on: January 06, 2021, 06:57:20 PM »
Hi, could you send us a support package?
  • Enable debug logging in Avast (check Settings->General->Troubleshooting->Enable debug logging) and restart (disable and enable) Web Shield in (Protection->Core Shields->Web Shield)
  • Try to induce issue
  • Make support package according to https://support.avast.com/en-ww/article/Submit-support-file
  • Disable debug logging in and restart Web Shield
  • You can send me the file ID of the support package, or write it here in this thread.


For now, disabling QUIC/HTTP3 scanning solves problem. We are working on fix.
Thank you for you cooperation.

Offline Michal Z.

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Re: Avast freezes/lags my google chrome
« Reply #5 on: January 06, 2021, 07:07:47 PM »
One more question - do this freezes occur only on google sites - google.com, youtube.com, etc. , or on other non-google domains too?

Offline Pierogi

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Re: Avast freezes/lags my google chrome
« Reply #6 on: January 06, 2021, 07:14:43 PM »
One more question - do this freezes occur only on google sites - google.com, youtube.com, etc. , or on other non-google domains too?

It happened to me also on Facebook. I didn't check more non-google sites.

Offline steveb980

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Re: Avast freezes/lags my google chrome
« Reply #7 on: January 06, 2021, 07:48:32 PM »
One more question - do this freezes occur only on google sites - google.com, youtube.com, etc. , or on other non-google domains too?

Mine are happening all over the place.

https://forum.avast.com/ - when I was opening new account

https://www.isitdownrightnow.com/ - when I try to paste any address to test there (massive lag/hang)

Twitch.tv - whenever I try to open new stream

Google Docs and Sheet - big lag whenever I try to open new document.

And ALL of the issues disappear as soon as I disable Web Shield!

I would say generally every page is a potential hang at one place/time.

Browsing is a pain entire day today. But I'm happy I have managed to pinpoint the issue, it was very frustrating in the begining.


Offline bob3160

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Re: Avast freezes/lags my google chrome
« Reply #8 on: January 06, 2021, 07:55:53 PM »
I noticed that when I unchecked QUIC/HTTP3 scanning that it increased
the speed of reaching all websites.
My question is what protection am I losing by doing this?
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://

Offline EH4472

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Re: Avast freezes/lags my google chrome
« Reply #9 on: January 06, 2021, 08:53:21 PM »
Hi there,

I'm having exactly the same issue with google chrome, just started happening today. It will be working fine one minute, then a random freeze/lag for no reason when accessing a website or typing something in the search bar. Only seems to be happening to chrome, otherwise the system feels responsive for other applications and IE seems to work ok as well.

Offline steveb980

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Re: Avast freezes/lags my google chrome
« Reply #10 on: January 06, 2021, 11:10:37 PM »
Opening Gmail completely killed my system. Everything was frozen. Only thing I could do is hard reset.

After restart I tried it with Web Shield off. No issue at all.

Then I turned Web Shield on, refreshed and system froze again :(

Offline RZPogi

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Re: Avast freezes/lags my google chrome
« Reply #11 on: January 08, 2021, 02:13:35 PM »
It also happens in Microsoft Edge (Chromium version). Google, Microsoft, and Facebook sites are affected. Yahoo sites not affected. Internet Explorer 11 isn't affected.

It seems disabling QUIC/HTTP3 scanning inside Webshield resolves this issue.
DESKTOP: Win 8.1 Pro, Avast 20 Free, Windows firewall, Malwarebytes free, Mcshield

LAPTOP: Win 10, Windows Defender, Malwarebytes free, Windows Firewall, Mcshield

Offline Asyn

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Re: Avast freezes/lags my google chrome
« Reply #12 on: January 08, 2021, 02:19:07 PM »
Hi guys, if you're willing to help, see Reply #4 from Michal.

PS: Just for the record, no issues with Firefox here.
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

Offline RZPogi

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Re: Avast freezes/lags my google chrome
« Reply #13 on: January 08, 2021, 02:36:06 PM »
File ID of my PC is 20210108_1327_5ZPD8_4273955891.zip

5ZPD8
DESKTOP: Win 8.1 Pro, Avast 20 Free, Windows firewall, Malwarebytes free, Mcshield

LAPTOP: Win 10, Windows Defender, Malwarebytes free, Windows Firewall, Mcshield

Offline Michal Z.

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Re: Avast freezes/lags my google chrome
« Reply #14 on: January 08, 2021, 03:02:14 PM »
Can anybody with problem try to open problematic site in chrome, press F12 to open console, and then right click on reload button (in top left corner of browser ) and select "empty cache and hard reload".  After this, does problem persists?

Next thing would help us is to check, if some resource in loading to website using QUIC does this freezes. Steps:
1) Open console  - press F12, press F5 to reload
2) Select network tab in console.
3) In table with loaded resources, add new column - Protocol (right click on column name, click "Protocol")
4) In address bar type problematic site and hit enter
5) See console, if any resource is loading too long, or didn't load. Screenshot would be helpful.

Thank in advance for you cooperation.