Hi Bruno,
I apologize for the delay in response. May I know what is the status of your internet U/D speed now? I would suggest you to repair AVG configuration and check if that helps.
To repair your AVG please follow these instructions:
Go to Start -> Control Panel.
Note: Click Settings first if Control Panel is not available in the Start menu.
Open (Programs) -> Programs and Features, or Add or Remove Programs.
Select AVG Internet Security in the list of programs.
Click the Change or Change/Remove button.
Select Repair.
Follow the instructions on your screen to complete the installation.
Restart your computer.
I have at&t Gigapower (FTTH 1 Gbps U/D) and after one week the download speed dropped to ~500 Mbps, then to 400 and finally at 200 Mbps. at&t techs came over and after changing the ONT (fiber interface) the Gateway (aka like a modem), we found the culprit
Short story: AVG Internet Security 2017, more specifically two components: ONLINE SHIELD (OLS) and FIREWALL (FW). The other components had no impact on the speed.
- OLS and FW OFF = U/D over 940 Mbps 
- OLS ON and FW OFF = U stays at ~900 Mbps but Down drops to around 400-500 Mbps
- OLS OFF and FW ON = U stays at ~900 Mbps and Down drops ~600-650 Mbps
- OLS ON and FW ON = U stays at ~900 Mbps but down drops to ~240 Mbps
They swapped the ONT three times, swapped the Gateway then while they were with Tier 2 they suggested to turn off the firewall. Once that was done speeds zoomed back to normal.
My homework: Scour the AVG forums to see what's going on. Some form of "memory leak" as the download speeds kept on dropping over time even after reboots.
Now I tried to selectively disable individual parts of OLS and FW but up to now I haven't found any specific setting that affects the speed. I do know it's those two components of "AVG IS 2017" which somehow dramatically affect download speeds over time.
Any suggestions as to what specific OLS and FW components might have such a dramatic effect to the HSI download speed? I know… 1 Gbps U/D is not common so does AVG IS 2017 support this?
Hello Bruno,
I'm sorry to hear about this. I request you to change AVG Firewall network profile to private (open AVG Internet Security > menu > settings > components > firewall > customize > network profile > change all the network public to private), please go to Firewall customize settings again > scroll down > click on system rules > enable all the system rules if it's not configured, please click OK and check if the download speed is normal with enabled AVG Internet Security.
Best regards,
Alok.
Thanks for the quick response. FYI O/S in Windows 10 Pro x64 up to date.
I followed your instructions to no avail. In other words, I set all of the network profiles from public to private, left automatic profile switching checked then set all System Rules to Enabled.
Here are the results:
Firewall set as requested and then turned ON (Online Shield OFF):
Download: 679.17 Mbps - Upload: 727.35 Mbps
Now if I leave the FW ON (the 679 & 727 numbers above) and turn on Online Shield, here is what I get:
Download: 384.99 Mbps - Upload: 773.54 Mbps <– Notice the heavy hit on the downloas side.
Now with both the Firewall and Online Shield turned OFF, I get:
Download: 943.08 Mbps - Upload: 942.24 Mbps <– which is what I am supposed to get
That's a HEAVY hit on throughput
You're welcome Bruno,
I have escalated this case to our senior team, we will contact you once we receive a reply.
Best regards,
Alok.
Hello Bruno,
I'm sorry to hear about this. I request you to change AVG Firewall network profile to private (open AVG Internet Security > menu > settings > components > firewall > customize > network profile > change all the network public to private), please go to Firewall customize settings again > scroll down > click on system rules > enable all the system rules if it's not configured, please click OK and check if the download speed is normal with enabled AVG Internet Security.
Best regards,
Alok.