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Don't bother reading this rant below unless you want technical details, but that administrator misconfigured his VPN to the point where OVPN underperformed by four times what it should have been.Its been ages since I played around with networking at a low-level (we're talking teenage years, when ARIN didn't charge for netblocks, and Cisco 7206VXR's could hold the entire internet BGP table in it), but I'll give it a go.1) It's not a fair comparison to begin with since OpenVPN is effectively maintaining a lot more information as it's acting as either a) as is in his configuration, a Layer 3 router, there's bound to be more overhead as it's maintaining a lot more information than a single Point-to-Point SSH connection; he should be using Bridged Mode and routing via a virtual switch at L2 instead. He sort of acknowledged this by making an appeal to the OSI layer, but then didn't check to see if there was a way to disable the full-routing functionality and move down to switching
OpenVPN is rock solid and just works (most of the time). If you are or have had problems with the native NordVPN app you could always go with OpenVPN. Works on anything, linux, mac, windows, IOS, android.