I was able get 4K 16000kbps on the test pattern last night at around 10:30pm, however earlier in the evening the best it would do was 1080P 5800kbps. I'm not sure if there is network optimization (a.k.a. throttling) happening during peak hours or if it's just network congestion but I can confirm the box is capable of 16M 4k Netflix.
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