They should walk you through getting it to factory condition which is the benchmark for the times to expect in each setup. If Startech has some added times which you didn't reveal just how long it took, then you may have to try other docks.
I got a Lenovo E560 with a Startech USB3SMDOCKHV, whenever I shut down the laptop with the docking station plugged in. It takes literally forever for the laptop to shut down.
The DisplayDock driver is updated, and all drivers on the laptop itself is updated.
Any insight? Thanks