Revit :: Architecture 2012 High Latency When Zooming

I'm having a technical question with a customers Revit Architecture 2012. The project he's working on is about 90 Megabytes in size, and the references are about 60MB. He is storing these on a network share. Unfortunately they are still on a 100MBit network. As Workstation he is using a DELL Precision M6500 (notebook) with the following specs:

when he is trying to zoom in on and out of this project, he is experiencing high waiting time between the zoom-steps, sometimes unbearably long. As the notebook is brandnew and tested I didn't blame it on faulty hardware.  So I suggested to run the same Project on a different machine.

I don't know much about the software architecture of Revit Architecture, so i don't know which hardware component is mostly stressed when zooming in and out (guessing the gfx, because the project needs to be recalculated?). I guess there lies the bottleneck.The customer requested an answer, which hardware needs to be exchanged / upgraded in order to accelerate the zoom-steps, decrease the latency.