It appears not to be a server issue (not sure though). But When the assembly is touched SolidWorks.exe goes to 100% CPU usage over one core (Windows 7). This lasts for a minute or two.
Further to this. I dug into my person’s issue and found she is trying to move a linkage. So when she is zoomed out it take a hella time to select the part surface to move it and then again to try to move it. But if she zooms in just enough she can move it no problem.