Even before 4K, WiFi had become the new performance bottleneck for video streaming. Unlike the fixed broadband access network WiFi is inherently un-deterministic and therefore unpredictable, so that in some homes it works fine for premium HD delivery, while in others receiving the same headline broadband bit rate, QoS is intermittent and poor. This was reflected in a recent survey by Arris finding that 53% of North American users reported streaming issues over WiFi, while 8% had persistent and serious problems. The story becomes more interesting when we drill down, since Arris seemed to identify different underlying causes for poor performance than other studies, for example from Turkish WiFi streaming specialist AirTies. Arris identified congestion as the principle issue, at…