This fixed my speed issues.
In your open vpn client settings I added this to my custom options.
My speeds went from 40Mbps, to 90Mbps.
My ping times also went from 27ms to 20ms
This was recommended from this thread. https://forum.netgate.com/topic/114212/aes-ni-cryptodev-openvpn-help-a-n00b-understand/23
fast-io
sndbuf 524288
rcvbuf 524288