After getting GlassWire set up last night I was streaming via a VPN, using Google Chrome for 2 - 3 hours.
When I looked at the GW graph it seems to have added the data used by Chrome as well as the data used by the OpenVPN Daemon into the total - see attachment.
Is this wrong or does VPN somehow cause the amount of data usage to double (doubtful)?
Yes, I know there’s an overhead … there’s a page on top10vpn site that goes into detail regarding mobile data usage, but it also applies to Data via an ISP. (sorry, can’t post the link)
The point that I didn’t explain very well was that almost ALL of the Google Chrome data in the screenshot was for streaming using OpenVPN protocol. I don’t use Chrome for much else - as you can see, I use Waterfox to browse usually. SO, GW has the data usage by OpenVPN Daemon as 3.6GB and Google Chrome data usage as 2.4GB, which pretty much ALL went through the OpenVPN Daemon.
GW is then obviously adding BOTH of these values into the total, when almost all of the Chrome data is already included in the OpenVPN Daemon value.
Sorry for the issue. If you check the data stats with another app do they show the same? It’s hard for me to comment because all VPN services can work in different ways.