It still looks driven by DirectX and the Intel drivers, but again, I can't validate for sure that these are the culprit (I can indeed see the USB calls to the network driver are gone, which is a positive). Whenever there's a spike in DPC or ISR in the KMDF driver, there's a corresponding spike in the DirectX driver. I'm not sure what else I could say other than talk to the OEM about performance of that particular hardware configuration. Does it repro when not in the dock?