ISPs give special preference to speedtest.net, so that their metrics will look better. Which means it rarely reflects actual reality. Theres a good chance this test is closer to the actual speeds you're getting everywhere but on speedtest.net.
I'm the author of the project. The servers are simply overloaded af unfortunately. It's a fairly popular project and we don't have enough servers to support this many concurrent users.
Occasionally some cloud providers or ISPs chime in and offer their servers to the public. If you have an LS server, you can submit it here: https://librespeed.org/submit
Certainly true in regards to real life use, but it's a good way to check that there isn't some issue on my end that's limiting the speed I am paying for
Fiber to the home is pretty neat. I could actually more than double the speed to 3Gb/s symmetrical for about $14 more per month, but frankly even the current speed is way more than I need. Will probably step it down a bit when my promotional discount ends.