I think speedtest-cli port is misbehaving.When i run speedtest-cli under OpenBSD OS it scores less then 40Mbit/s.
But when i use this openbsd device as a router i can get the real internet speed which is 400mbit/s. (IP Forward + PF + NAT)
I deployed an OpenBSD server on vultr.com assuming there might be a problem with my ISP.
But the result was even worse. (7mbit / s)
Later I installed another OS using only the change os option on vultr and I got 4380.05 Mbit / s speed as download.
I think there is some oddness about speedtest-cli port of OpenBSD.
Thanks for reading.