Avg Internet Security: Firefox slow and partially loaded pages when Web Protection activated

Hello Sebastiano. 
Thank you for contacting AVG Community Support.
We apologize for the inconvenience caused to you.
We request you to try the steps provided in the link and check once : | AVG (https://support.avg.com/SupportArticleView?l=en&urlname=troubleshoot-avg-antivirus-web-shield)
Please let us know if you need any other help with AVG.
Thank you.

Hi everyone,
since a few months ago, firefox started to have issues in loading google pages. After several checks, and no valid answer found on mozilla forum, I've realized the issue is related to the "web protection" function of AVG Internet Security. When activated, google pages load slow or load partially, with the result that several functions don't work correctly. I need to refresh the page several times and sometime happens they load correctly, but the best thing to do seems to deactivate Web Protection. Does some one know a definitive solution for this problem?
When using Chrome I don't have any problem in loading google pages.
Thank you in advance.
 

Hello Sebastiano. 
Thank you for contacting AVG Community Support.
We apologize for the inconvenience caused to you.
We request you to try the steps provided in the link and check once : | AVG (https://support.avg.com/SupportArticleView?l=en&urlname=troubleshoot-avg-antivirus-web-shield)
Please let us know if you need any other help with AVG.
Thank you.