If you want to do an ongoing speedtest with graphs for up- and download, forget about the web-based tools like speedtest.net and fast.com – those are nice if you are on mobile. Yet, when you are on a *nix machine, there’s better tooling in your Shell.
First, fire up a Terminal and start `nload` to view network traffic. If you are on macOS, you can also use the graphical tool ‘activity monitor`.
Then, in a second Terminal, start a permanent upload or download with the following commands:
ssh email@example.com "cat /dev/urandom" > /dev/null
cat /dev/urandom| ssh firstname.lastname@example.org "cat > /dev/null"
Note that depending on your `ssh` configuration, you might need to disable compression on the client or server side.