Single core on ARMs (CCR2004 or RB4011) has a bit better single core performance, but do not expect magic. You will still not be able to do 600 / 600Mbs over OVPN.
I’m also intrested. I have also CCR1009-7G-1C. And i never rech more then 35 MBit/s with OpenVPN. Before i used the CCR1009-7G-1C i have run this Tunnel on a very old IBM Server and it was about 4-5 times faster. Now i have modern router hardware and i have this very poor performance.
Why do we have hw acceleration on IPSec but not for OpenVPN?