That's the SOC I was talking about unfortunately 
Edit: For reference, here are some Wireguard benchmarks: Comparative Throughput Testing Including NAT, SQM, WireGuard, and OpenVPN
As you can see, you really need a top-end mvebu device or x86 to push over 500 mbit/s over wireguard. A Raspberry Pi 4 might also be up for the task, but don't quote me on that.
Edit 2: Yes, seems like it is up to the task: https://www.reddit.com/r/WireGuard/comments/eeafds/wireguard_throughput_on_raspberry_pi_4/