@coaley to watch TV in UHD while someone is playing games is going to use around 35Mb/s so if you have a slower connection thst could be the cause as could poor WiFi in your home. A Sky hub should cope with one game and one TV stream without adding latency but will struggle if there were mulitple other users.
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65inch Sky Glass, 3 Sky Streaming Pucks, Sky Ultrafast + and Sky SR213(white Wifi Max hub) main Wifi from 3 TP-Link Deco M4 units in access point mode
