SSH does it's own flow control, and with HPN-SSH it is much better. Also, if your connection to the VPN host is quite good, then the TCP-over-TCP issue does no

SSH does it's own flow control, and with HPN-SSH it is much better. Also, if your connection to the VPN host is quite good, then the TCP-over-TCP issue does not apply as much. The bad cases happen when that connection has packet loss.