Version: 19.8 (September 2019)

[bob3160]

Avast Premium Security ver 19.8.2393
Windows 10 Pro v1903 build 18362.418

I run charting software (sierrachart - https://www.sierrachart.com) that uses multiple windows (both independant floating windows and MDI child windows within the main application).

When moving focus from one window to another, Avast Premium Security (or sometimes Avast Behaviour Shield) is seen in the task manager to spike in CPU usage, whilst also causing my application to become unresponsive for a short period of time. Avast Premium Security is also seen to spike when first opening the program.

I have added the program, it's folder and associated data files to the exceptions list, but this has no effect at all.
I have also tried disabling the shields for 10 minutes, but this has no effect either - in fact Avast CPU spikes are more apparent even though it is apparently disabled.

To say that the current behaviour and associated performance impact is undesirable would be an understatement, how do I fix this?

edit: I should add that I have already 'repaired' the application and also tried to run in passive mode - neither of these options were successful.

Rather strange since passive mode turns off Avast. If Avast were the problem, passive mode should have solved the problem. 

[geoffsmith81]

Rather strange since passive mode turns off Avast. If Avast were the problem, passive mode should have solved the problem. 
[/quote]
Yes, that was my expectation for passive mode, however Avast is clearly visible in task manager or process explorer.
With Avast completely disabled (instead using windows defender), the behaviour of my software is now as expected.

[smc425]

Does anyone know when the next version is being released? I have the Premium Security suite but had to put the firewall to sleep until Avast fixes their issues.

[bob3160]

Rather strange since passive mode turns off Avast. If Avast were the problem, passive mode should have solved the problem. 

Yes, that was my expectation for passive mode, however Avast is clearly visible in task manager or process explorer.
With Avast completely disabled (instead using windows defender), the behaviour of my software is now as expected.
Did you reboot your system after switching to passive mode?

[geoffsmith81]

Did you reboot your system after switching to passive mode?
[/quote]
Yes, more than once.

Also tried disabling individual shields, reboot, then test.
Same result every time.

Also fail to understand why setting exceptions for programme and files has no noticable effect.

[bob3160]

I've reported this to Avast let's see if that helps.

[geoffsmith81]

I've reported this to Avast let's see if that helps.

Ok thanks very much.

[karol.kurczuk]

I try,new version is better than older version? Older version using very cpu and memory and the internet destabilise.

[heikwith]

My last update is 191015-6 for my free avast 19.8.2393 (versie 19.8.4793.541).
Is this OK of not ?

[DavidR]

My last update is 191015-6 for my free avast 19.8.2393 (versie 19.8.4793.541).
Is this OK of not ?

Several topics specifically about this, I suggest that you monitor one of them.
Check this one out https://forum.avast.com/index.php?topic=229974.0.

[Pako7]

Does anyone know when the next version is being released? I have the Premium Security suite but had to put the firewall to sleep until Avast fixes their issues.

when its ready it will be released ...   back to your Problem did you try repairing your Avast?? if it failed how about you do a clean install?? am saying all this because i used to see the pop up notification stating that my firewall is off even on windows security though i didn't use  ws ...

and after this new update , iv never really seen that notification .....so i guess its fixed ....

[smc425]

Pako,
I’ve performed repair installations and clean installations a few times. This is a common issue among Many users. Luckily for you and others, there are a precious few who are not plagued with this glitch. Avast is clearly sleeping on the issue. You can submit a thousand support logs to them....they won’t take ownership of the problem and are quick to pass the blame onto other software. Since February I have been waiting on a new release to patch this firewall issue. It’s ridiculous now that I have a paid subscription for Premier Security and have to use an alternative firewall for the time being.

[Pako7]

Lets hope you`l smile after the new stable release because seems like a few bugs have been fixed on the upcoming release hopefully that bug may also be addressed

Beta : https://forum.avast.com/index.php?topic=229911.0

[vstsr]

Avast Premium Security ver 19.8.2393
Windows 10 Pro v1903 build 18362.418

I run charting software (sierrachart - https://www.sierrachart.com) that uses multiple windows (both independant floating windows and MDI child windows within the main application).

When moving focus from one window to another, Avast Premium Security (or sometimes Avast Behaviour Shield) is seen in the task manager to spike in CPU usage, whilst also causing my application to become unresponsive for a short period of time. Avast Premium Security is also seen to spike when first opening the program.

I have added the program, it's folder and associated data files to the exceptions list, but this has no effect at all.
I have also tried disabling the shields for 10 minutes, but this has no effect either - in fact Avast CPU spikes are more apparent even though it is apparently disabled.

To say that the current behaviour and associated performance impact is undesirable would be an understatement, how do I fix this?

edit: I should add that I have already 'repaired' the application and also tried to run in passive mode - neither of these options were successful.

The only way I found to get rid of odd/erratic behaviors of avast is to uninstall the behavior shield (and web shield and mail shield). It creeps into everything, and it interferes with much better behavior shield of comodo (HIPS). Same goes for driver updater (always only take driver updates from your system manufacturer, not third party, not even part manufacturer) and system fixer (ccleaner), and all other such parts (even vpn, get one with manual firewall/kill switch which works before and after).

[DavidR]

<snip quote>
The only way I found to get rid of odd/erratic behaviors of avast is to uninstall the behavior shield (and web shield and mail shield). It creeps into everything, and it interferes with much better behavior shield of comodo (HIPS). Same goes for driver updater (always only take driver updates from your system manufacturer, not third party, not even part manufacturer) and system fixer (ccleaner), and all other such parts (even vpn, get one with manual firewall/kill switch which works before and after).

And there you mention the magic word C o m o d o, there are many instances in this forum of conflict between the two.

In the same way removing C o m o d o would probably remove any possible "odd/erratic" behaviours as removing one side of a conflict is likely to resolve it..