The Speed Test in AC Utilities says about 0.3 seconds from the main machine and about 0.9 seconds from one of the laptops.This could a better hint to fix the problem.
So ryanjo said he gets 0.3 from clients. That doesn't sound like a huge difference. Has anyone else done the test, can report the times they are getting?
What is the test measuring anyway. As I said ping times are 0.001 seconds, so it's not a ping. It must consist of a bunch of back and forths? And then login itself must consist of still more back and forths?
