I would like to second OP on the issues.
I've been having the same problems for roughly 8 months. It most notably happens in web browsers. The mouse "slows down" whenever I hover over a link, pictures, etc. It even slows down when hovering over tabs in firefox. the mouse will lag as well as the window when dragging any type of window on the external monitors.
I've gone through Dell's website for their drives and have had this problem and I've been using DisplayLink drivers from this site for probably 6 months. I've recently re-installed Windows 8.1 to see if that would clear up the issue, but it still happens consistently.
Setup:
-Dell e7440 (Running windows 8.1)
-D5000 Docking Station
-1x Dell 1080p display (laptop)
-2x 24" 1080p monitors connected through Display Port and HDMI (Both to DVI)
Software:
-Display Link: 7.7.59503.0
-Dock Firmware: 2.1.1.4731
-Wireless HUB: 1.8.5.1280
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