I recently upgraded laptops from a Lenovo with Lenovo dock to a Dell Inspiron 13 and bought a Plugable UD 3900 dock. My dock is doing great running two external monitors, handling the hardwired ethernet and external audio. One item is causing issue - external keyboard and mice.
In the Lenovo setup I used the usb wireless dongle plugged into the dock and the keyboard and mouse were great. With the Inspiron/Plugable setup if I plug any wireless mouse (have tried multiple) into the laptop they work perfectly. Same for the keyboard.
When plugged into the dock any of these devices experiences a lag that his horrible. I’m not talking from a gamer perspective, I’m talking from just using them at all perspective. Hopefully this is a problem you have seen and there’s a fix.