We attempted to reproduce your findings in our test labs with a Windows host running the 2004 build, as well as the DisplayLink 9.3 M2 version. We used a UD-ULTDCL docking station of course for the Ethernet connection.
Our local iPerf test resulted speeds over 800Mbps, which is typically what we can expect, and obviously does not match your experience.
There is no obligation to continue troubleshooting here, but if you would like, we would be interested in seeing if you can see the same Ethernet speed limitation with DisplayLink’s newest driver of 10.0 M0:
- Disconnect the dock from the system and please remove the power cable from the dock so it turns off completely (this is important so the unit resets). Please keep it disconnected until the last step
- Uninstall any and all software with ‘DisplayLink’ in the title that is present from within the Control Panel -> Programs and Features. Don’t worry if these entries are not present or if the process does not work, just move onto the next step
- Download, extract and run the DisplayLink cleaner tool (https://s3.amazonaws.com/plugable/bin/DisplayLink/DisplayLink+Installation+Cleaner+9.1.1462.exe)
- Once the Cleaner has been run, reboot (even if not prompted to)
- Now download and install the 10.0 M0 DisplayLink software (https://www.displaylink.com/downloads/file?id=1649)
- Reattach the power cable to the dock first. Once the dock is powered on, reconnect it to your system which will trigger the final portion of the installation
Once again, if you would rather not spend more time here, please feel free to disregard and we can close this topic.