It doesn't seem to me that the network infrastucture -- at least the switch speed or cable specs -- is what determines the practical speed of AC.
I can't really tell much difference between the wireless and wired computers when they are just connecting to the AC server in my office.
What is really slow is the Internet --sometimes -- when ERx can be maddeningly slow. The fact that it can also be very fast suggests to me it has nothing to do with my switches, cables, wireless access points, routers, internet gateways -- but something with ISP and internet backbone and servers at the Epharmacy end (and maybe with how intensely the Feds are looking into the transmissions?) than anything I have any control over.