Speed Up Generating Openvpn Key

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OpenVPN Client Key Generator. GitHub Gist: instantly share code, notes, and snippets. How to connect your Android devices to an OpenVPN VPN. Such as haveged, to speed things up here): $./build-dh Generating DH parameters, 2048 bit long safe prime, generator 2 This is going to take a long time # rest of output. Generating a random key to be used as a shared secret helps in increasing OpenVPN's resiliency to these attacks.

Hello OpenVPN community,
I've been struggling with this for the past days and I have not made any progress so far. The configuration of OpenVPN was delightfully straight forward and pretty much everything worked out of the box. The only thing wrong with the installation are the transfer speeds. Without OpenVPN 'iperf' reports about 300 mbps download speed. As soon as OpenVPN is involved the speed drops to anywhere between 10 and 70 mbps depending on different mtu/crypto configurations.
I've been able to reproduce the issue in a simple adhoc VPN.

Openvpn Speed Limit


Server (Debian 8):Client (Ubuntu 16.04):

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This gives me about 35 mbps on a link that should be 300 mbps. The situation is much worse when using tcp at 2-11 mbps. I've experimented with countless combinations of tun-mtu/fragment/mssfix/sndbuf/rcvbuf and many more, the maximum I've ever reached was about 60-70 mbps by adding the following parameters:CPU usage on the client is <50% and on the server it's <20%. I've tried different ports as well (443 for example) and iperf over an SSH tunnel gives me almost the full 300 mbps.
While researching this issue I've found people who have the same problem with no solution, people who had to change a tun-mtu or buf setting and the issue was gone, people who say that this is normal and people who say that the overhead should be max 10%. None of the setting changes I've found have helped.

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If anyone has any idea as to what might be causing the slowdown and how we can get at least 100mbps out of the VPN that would be greatly appreciated!