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That said, I can and do get 200mbps+ on fast.com (my preferred/goto speedtest), and still experience constant buffering and the "sorry we can't play that video right now" message that kicks me out but then just clicking play again works.

I'm not saying it's their servers or network, but I haven't found a reason for it based on my fast.com results.

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> but then just clicking pay again works

freudian slip much?

Good catch!

It may be that your ISP, or another organisation that your traffic flows through, has implemented an efficient and accurate-enough way to identify speed-test traffic from amongst the actual video traffic. Possibly just by assuming that after a few minutes of transfer or a certain amount of traffic, your current use is not likely to be just for speed testing.

I assume this is why the tester does not run an upstream test by default: otherwise the lack of a block of upstream traffic would be a good signal that video playing is going on rather than throughput testing.

Possibly. I wouldn't put anything past optimum after they started injecting advertisements for new channels and packages on my non-https traffic.

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