Thanks for the responses.
I wish i did have access to more info on the topography, but they keep configuration info under lock and key, and the only tech staff available to the public are the folks who are here to tell you how to format word documents, etc , and they know nothing about the hardware. When you do try to talk to one of the real IT people, they give you this look like "OMG one of the monkeys is trying to speak" because they have no responsibility to the general public.
The games run fine on a home broadband connection with an I3 or Athlon 64 type machine, it's just odd how at the library the slower machines seem to bog down trying to load all the graphics on the screen, typically taking 3-5 minutes for all graphic elements to populate, whereas the same screen with all elements will load in 5-10 seconds on one of the newer machines.
You get the feeling on one of the slower machines like you're being crowded away from the server, as though you're being dealt an extremely thin time slice...
FWIW, 3 or so years ago when the LAN was made up of 520's and 755's running Windows XP pro, everything seemed to run fine. Then they rolled out Win7 pro onto all of the machines, and the 520's ran like junk ever after, typically taking more than 5 minutes just to reboot.. Since the 755's were running fine, I just figured this was a RAM issue for the 520's.
But, when they replaced the 520's with 7010's (also running Win 7 pro), and the performance of the 755's immediately went down to garbage, I was puzzled ....to say the least.