If I search "speed test," the default widget that comes up is provided by Cloudflare. It gives me a download speed, then nothing else happens. (Search done on my MacBook Air, over an Orbi mesh wifi system with gigabit fiber.)

If I click Stop Test then start again, I get this:

Reloading the page and starting again, it gets stuck here:

For reference, this is the result I get from fast.com.

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Basically, if the Cloudflare speed test isn't reliable, then it shouldn't come up as a widget.