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There should be some catch in the setup. Maybe the CPUs he used are old and don't support hardware AES acceleration?

I just run iperf3 over OpenVPN / UDP with AES-256-GCM between two servers in the same DC (but different rooms, through their public network, 1gE links) and got an average of 750MBits/sec. I don't have any special setting.

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Out of curiosity -- what's your SSH tunneling rate in the same setup?

Just tested. Ssh has indeed better performance, at around 870Mbit/sec.

But the gap in my -anecdotal- testing is much smaller than OP's and maybe predictable due to the differences (as OP described) on how OpenVPN and ssh work.

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