Fast, smooth data download speed is kind of important to mobile video, especially now that even mid-range Android phones are rocking 1080p screens. That's part of the reason that Netflix created FAST.com, its own branded alternative to web speed tests like Ookla's SpeedTest.net, back in May. The idea is to make sure you're getting an accurate test across multiple services (there's even a SpeedTest.net link right on the page) and your internet service provider isn't throttling your connection.
Netflix publishes a dedicated Android app for its FAST Speed Test was written by the awesome team at Android Police.