Let the hive mind of Engadget get that for you.
"I am looking for a device that will stream sound from one source to several recipients. For example, I want to stream sound from my TV or stereo to my phone or MP3 player that has radio and Bluetooth capabilities. I have looked into radio transmitters and they seem like a decent choice, but I can't find one that uses external power (USB or from the plug) and I would want one with a transmit range of around 50 meters. Thanks!"
I used to get four dots but now I usually get two or 3. I have 6 Megabit DSL and don't do anything else on the connection while using the Roku. I have done speed tests and nothing seems to be an issue, I can only guess that maybe the streaming servers are just getting used more and more.