510
LibreSpeed - Speed Test
(librespeed.org)
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Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
I mean, how else are you going to do a speed test?
I use iperf3 with Speedtest's servers, personally. But for a browser, yes JavaScript is needed.... But needing JavaScript files from like 20 different domains is typically a red flag for me on any site.
It doesn't need javascript from "20 different domains", only a file called empty.php is fetched from those servers to measure the ping. The javascript is hosted on librespeed.org, which is under my control.
Speedtest cli