Your Internet speed (i.e. bandwidth) determines how many devices can access your internet at one time, and how fast. The most bandwidth consuming process is typically streaming video from the internet. To stream full HD (1080p) video, it is typically recommended to have internet of at least 5mbps, however, if you only have 5mbps internet, you will really only be able to have that specific streaming device connected to your internet, or else your video streaming quality will degrade significantly.