Okay, what magic sauce does Netflix use for streaming?

I've tried a multitude of video streaming services over the past few weeks, all using my 3 MiFi.

Sky Go just pauses every few seconds, making it unwatchable. LoveFilm does the same, and often just stops playing completely. iPlayer will often work fine for an hour or so, then I'll just get a black screen (but audio continues).

Yet Netflix just carries on regardless. It degrades the video quality should the net speed drop, but that's fine. That's how it should be. It's far less distracting than losing the video completely.

Whatever they're using, I'm pleased they do. (And I suspect it's this).