How fast can I stream a torrent file?

That depends on the quality of your Internet connection and the number of quality peers (users seeding) for your torrent file. The number of peers can be found below the player window when you load a torrent file into https://www.utorrent.com/lite/. If you see a ‘Low peers’ dialog next to the number of peers, then you may experience buffering or may not be able to play the file at all. Potential solutions are to try the torrent again when more peers are available or try to find a different .torrent file with more seeders.