Question VPN speed reduction of 75%

Jul 16, 2021
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Working on a home system.
Internet provider - Xfinity
Modem is owned by homeowner - Arris Surfboard 6190
Router is Orbi RBR50
Trying to install VPN on local devices.

1. Windows 10 computer with hardwire to router, here is what speeds I get:
Note: System has Norton 360, but no difference with firewall and antivirus activated/deactivated.

Speedtest Results
at router 826.82 Mbps down
at computer without any VPN - 257 Mbps down
at computer with Norton VPN - 90 Mbps down
at computer with Surfshark VPN (IKEv2) - 78 MBps down

Checked router - there is an option to turn on VPN. Tried it on and off. No change. This is really for installing router level OpenVPN.
Note: With SurfShark, cannot get Wiseguard or OpenVPN(UDP) protocols to even connect after trying multiple servers,
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Now I installed SurfShark on a streamgenie android media box that is hardwired into the same Orbi router and Arris modem. Saw the same results of about 75% speed reduction.
By process of elimination, I can rule out the computer and android media player since both have same issues with different operating systems and computer was checked with two different VPN softwares. This points toward the culprit being:
  1. Orbi router
  2. Arris modem, or
  3. Xfinity service
Anyone run into this as I cannot find anything on the internet and SurfShark wasn't any help either.
Everything I read is that a VPN shouldn't cut speed by more than about 10%.
 
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