I have no idea about the list on dnsperf.com for example digital ocean dns isn't fast at all, but it is top 5 on the list, and quite a few service on the list doesn't offer to small individual users. Source: almost 2 years ago

Cloudflare (at least for DNS if you don't want other features... See dnsperf.com for why). Source: about 3 years ago

Or, you can follow the installation instructions on the official GitHub repository: SpeedTest-CLI Installation Guide. - Source: dev.to / 21 days ago

That's a community cli client https://github.com/sivel/speedtest-cli rather than the official cli client https://www.speedtest.net/apps/cli. Source: 12 months ago

If you read the docs for Speedtest-CLI you will see that the program timeouts after 10 seconds. Try using this for default timeout of 1 minute and also redirect errors to the same file. Speedtest-cli --timeout 60 >> /bin/speedtestoutput.txt 2>&1. Source: over 1 year ago

Already exists https://github.com/sivel/speedtest-cli/, mature, stable, packaged in major distributions. Source: over 1 year ago

I have an open-source software, which can show some stats about your PC/Server. One of those stats is internet speed. I have been using speedtest-cli for now, since it is open-source and runs without having to accept any license agreements. Source: about 2 years ago