Ultraflix 1.7 has setting for internet speed. You can pick automatic or 6 up to18 Mbps. I did try 18 Mbps but I got lots of hiccups or buffering during playback but when I set it to 6mbps I barely get hiccups. I have a relatively sustained 6mbps internet speed so I occasionally get hiccup. Ntek recommends setting it below your actual internet speed to avoid unnecessary buffering. If we have 4mbps option then that would eliminate completely my problem.