Safe, Private, Easy Way to Test Connection Speed?

[flipperpull]

Hi, learning user for Linux and Linux Lite here. I am wondering what is the best, most private, and easy way to test Internet connection speed? I have concerns re: speedtest.net as it apparently collects much data. Is there a good way to run a utility, preferably with a GUI, that tells me how fast a connection is?

Thanks!

Editing to add: I am hoping to get the Mbps max download speed of a new connection, like what Speedtest.net does, only more private. I tried CBM (Color Bandwidth Meter), but it seems to be just monitoring the speed of current usage, unless I understand it wrong.