John has a Roku Box, but he's not getting fast enough download speeds for streaming in HD. He's got a 7Mb/s DSL connection, but he only gets 1Mb/s when streaming.
Leo says that being wired instead of using WiFi would improve John's speeds. Wireless can have interference and other issues that will slow down performance. Directly connecting to the modem will at least bring half that loss back. Since the Roku he has is only capable of WiFi, Leo recommends getting the better XS Roku which would allow him to connect it to ethernet.
He should also try upgrading his router's firmware.