This is why most well-known speed test sites are useless, in that they are carefully gamed by the ISPs, so that they show you only the maximum speed you could r

This is why most well-known speed test sites are useless, in that they are carefully gamed by the ISPs, so that they show you only the maximum speed you could reasonably achieve to their highly localized high speed network. It tells you little or nothing about what you could get to anywhere else. The dslreports speed test is pretty good, and the one from fast.com should give you a pretty accurate picture of what you could see from the Netflix infrastructure. Beyond that, you need to run your own CLI tools and be in control of both ends.