The "Moon Streamer" is an additional paid service that sends current trades from a dedicated server located in Tokyo, Japan, over a UDP connection to your MoonBot terminal. If your connection to the exchange is lagging, a connection to the Moon Streamer can help you to see the crosses (trades) and the chart in real time again. If you are trading on a dedicated server (VDS) there is not much to gain by using the Moon Streamer, the Moon Streamer is mainly useful if you are trading on your local computer.