Try this:  disconnect from VPN.  Run wire shark if all windows updates are installed. You can now close wireshark.  go to network properties, then adapter settings.  Right click-properties on the VPN adapter.  Uncheck ipv6, then Click on IPv4 and click properties.  Then click advanced button in that screen.  Uncheck the box that says “use remote gateway”.  Click ok to save the screen.  The will let internet traffic pass through your local gateway instead of passing it all through the VPN.  Connect to the VPN and do another speed test.  Wire shark still required if your windows updates are current to make VPN connection stable.  Hopefull this fixes the internet speed issue. ... View more

Curios.  What are brands of the network cards in each computer.  The ones that I had issues with were all intel. My two most recent problem PCs were Lenovo desktop PCs with intel NICs. ... View more

Following up on this old thread.  Latest patch from Microsoft for Windows 11 in April 2023 has broken VPN again.  I'm using built in windows VPN client L2TP/Ipsec.  VPN will connect (slowly), internet works fine since I'm using local gateway.  File browsing to the remote network is completely unstable and not usable.  Running wireshark as mentioned in previous posts completely fixes the issue.  Searched the internet for quite some time before stumbling on this post.  The wireshark workaround is incredibly randon, But I was pleasantly surprised when I tried it as a last ditch effort and it worked.  Only need to open wireshark once after bootup, then VPN connection works perfectly.  Windows 10 not affected with this bug, only windows 11.  Seems to be localized to PC's with only Intel Wifi or Ethernet cards.  Other brand cards don't seem affected.  Running windows 11 v22H2, build 22621.1635. ... View more