I also have found a way to reproduce the above issue with my company's Dell 7280 laptops connected via USB-C.
If I connected the 7280+D6000 to a older 19" monitor that only has DVI inputs (therefore I need to use a DP to DVI adapter) the NIC slowness persist.
If I then connect the same 7280+D6000 combo to a newer 34" screen via DP to DP, the slowness goes away.
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