Hello. Is there way to activate or use the ovpn-dco https://openvpn.net/blog/openvpn-data-channel-offload/ to gain the normal speed for openvpn connection ?
DCO is an implementation detail of the original OpenVPN software. As far as I am aware, Mikrotik does not use the original OpenVPN software, they have reimplemented the OpenVPN protocol handling themselves.