Streaming rate

anyone know why the streaming rate is so low? local channel broadcasting in atsc3.
below is from tuner status.
|Modulation Lock|atsc3|
|Signal Strength|97%|
|Signal Quality|88%|
|Symbol Quality|100%|
|Streaming Rate|4.980 Mbps|
|Resource Lock||

ATSC3 uses higher compression

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anyway to tell that channel is in 4k?

No stations are in 4k yet, and not for a long long time

thanks you.