Same problem with Yoga
I have a Lenovo Yoga 2 Pro with an Anker USB 3.0 dock that is having the same problems as btitus and I think it has to do with mode switching as well.
The computer lags badly when plugged into the dock and seems to behave better when the touchpad/keyboard has been initiated.
I have 7.4 M2 update and windows 8.1. Attached is my support file.
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