This post https://forum.openwrt.org/t/a-wireguard-comparison-db/ contains Wireguard benchmark results from a couple of BPI-R4 users which might be useful to add.
In addition this post https://forum.openwrt.org/t/please-run-iperf3-c-127-0-0-1-and-post-results-here-to-make-router-database/ contains iperf3 benchmark results