It's not just a performance problem. OpenSSH's VPN works by encapsulating either IP packets (tun) or Ethernet frames (tap) in TCP. Now you suffer from head of l

It's not just a performance problem. OpenSSH's VPN works by encapsulating either IP packets (tun) or Ethernet frames (tap) in TCP. Now you suffer from head of line blocking and nested congestion control. If you want an easy to use userspace VPN use OpenVPN. It may be bloated, but it works a lot better than IP over TCP can ever work.