Hi James,
We're experiencing the same problem with the Targus USB 3 docks on Dell Latitude E6320 running Windows 8.1 Update 1. Displaylink 7.6 had some minor mouse lag issues and it is definitely worse using Displaylink 7.6 M1.
The E6320 has an Intel HD 3000 GPU. We've had no issues with this model running Windows 8 on the Dell branded Targus USB 3 docks.
I'll post the displaylink debug logs if that helps.
Cheers
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