In our connected world, it is good to now in what shape our network is, from the end-user perspective. While we may not be able to change the network environment, knowing it's limits is useful. If you have to upload a large ISO image to the server, you can decide to go grab a coffee after the transfer starts, if you know your corporate network will not be able to transfer that much data in the next hour.
This is a companion discussion topic for the original entry at https://linuxconfig.org/how-to-install-iperf-on-redhat-8
These instructions are for installing iperf3, not iperf - they are different projects entirely.