Slow start and close of smart scan

Hello Giovanni, 
Thank you for contacting AVG Community Support.
We understand that you are facing issue with the scan. 
We are really sorry to know this. We'll certainly check and help you out.
Could you please let me know on which device you are facing this issue? 
Also is the a paid version of AVG or free version? 
Due to the internal policy we are unable to see the video you have shared us. 
Could you please share a screenshot of it? 
Here is an article for taking screenshot: | AVG (https://support.avg.com/SupportArticleView?l=en&urlName=avg-create-screenshot&q=screenshot&supportType=home)
Thank you and keep us updated.

In the attached video I recorded the entire scanning phase, as you can see at first it takes almost 1 minute to start the scan, then I accelerated the scanning phase, as you can see from the timer I put on the bottom left, and then from minute 2:00 of the video (4:32 on the timer), the closing phase of the scan begins, which takes another minute to complete.

https://streamable.com/f60hc0
 

Thank you for writing back to us, Giovanni.

We're able to access the Gif you've shared.
First, could you let us know if you have any other antivirus software installed in your computer other than AVG Antivirus Free?
Second, please repair your AVG Antivirus Free as mentioned in this article, restart your computer once and check if the issue persists.
Keep us updated.

I'm on a laptop with Windows 10 and AVG free.
Below I put an animated gif (hopefully supported by the forum) with the whole sequence, there are 7 screenshots.
Actually when I write frozen screen, I mean that the process of closing the scan takes 1 minute to complete, but actually the screen can still be closed with the X, but if I then reopen immediately after AVG, the scans will not be available until the procedure will not actually be completed.

User-added image

I use COMODO Firewall in the version without antivirus, I tried to remove it and repair AVG, then I did a smart scan, and the waiting time for the scan to close was reduced to 16 sec.
Then I reinstalled CFW and ran smart scan again, and the waiting time for closing was about 20 sec. so it doesn't seem to affect much.

Reinstall didn't fix it either, I think I'll keep it that way.
Thanks for the suggestions, which still helped to halve the waiting time.
Greetings

Hello Giovanni, 
Thank you for the reply. 
We understand that you still face the issue. 
We apologize for the inconvenience caused to you.
We certainly check and help you with the issue caused
We have sent an email to your email address offering additional help please check the email and revert us back for further help.