Just like a poster from two months ago (Ry Lickliter Slow LAN speeds from dock?):
I’m having extremely slow lan speeds, like 20 mbps on a 300 mb network when connected to the PLUGABLE USB-C TRIPLE DISPLAY DOCKING STATION. Wifi is fine, only when connected to the dock do I get extremely slow speeds.
The only solution suggested at the time was to try a different network cable. I did that, and still same results.
I have a 2016 Macbook Pro w/Touchbar, just like the original poster. I just updated to the lastest DisplayLink drivers today and still same results. Any other suggestions?