I have the Plugable UD-6950 USB 3.0 Dual DisplayPort 4K dock and everything is so choppy and laggy on the external monitor that it is unusable. The mouse mouvement is really choppy and scrolling is horrible. It works well on the integrated monitor, so it is definitely related to the dock.
My computer is a Lenovo Thinkpad Yoga with integrated and dedicated video card (Intel HD5500 and Nvidia 940M). The dock is connected to a USB 3.0 port.
I have the last version of the displaylink drivers (8.3) and Windows up to date.
I also tried removing everything related to displaylink, apply your cleaning tool, and then install the last version of displaylink again but I still have the issue.
I am about to return the product but I want to give it a last chance through this forum.