I have similar issues with a Dell Docking Station, and Dell laptop. Mouse/Keyboard lags when using docking station with two monitors attached to docking station. No issues whatsoever when using the laptop with the same keyboard/mouse. I have updated usb 3.0 drivers, and have version 7.5 installed, no improvement in performance.
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Dell XPS14z
Dell 3.0 Docking Station
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