Netflix's Fast.com internet speed test is pretty much the defacto way to check download throughput. Since it uses Netflix's servers to test, you can easily check if your ISP is throttling your video. And it's more likely to reflect the sort of speeds you'll actually see in the real world compared to things like speedtest.net, which often reports unrealistic or inflated numbers. Now Netflix has added some extra info to its test, including latency and upload speeds. 

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