iperf3

iptables -I INPUT -i wg0 -p tcp --dport 4455 -j ACCEPT
iptables -I INPUT -i wg0 -p udp --dport 4455 -j ACCEPT

Iperf server side

iPerf3 -s -p 4545

Iperf client side

iPerf3 -c 10.10.10.1 -p 4545