Slow Wired Internet Speeds

I just purchased the Plugable USB 3.0 Dual 4K Display Docking Station and have a very slow internet speed when connected via Ethernet cable. I have Spectrum Internet with an ASUS ROG router. My internet speeds via wi-fi are usually 480 download and 25 upload. When connected to the docking station, my download is 90 and upload 15. I have updated Displaylink and changed QoS settings but still get slow speeds. Any suggestions?

Thank you for contacting Plugable support. We would like to take a closer look at your system to better help assist but require some additional information. Instead of posting that information here, could you please contact us directly via email? To do this, please email us at support@plugable.com. In the subject of your direct email, please reference case 383571, which will allow us to match things up and then provide the next steps.

Apologies for the extra steps in the process, and we thank you for giving us the chance to help!

Best regards,

Michael S.