Do you know if the old open street map trick of having multiple tile servers (that are each just aliases of the same server) still works? I think this was how they tried circumventing the 6 connection limit
Your webserver still has to spin off a thread for each request if you want to do substantial CPU work for each request, but rest assured you'll get all the requests at once from the browser. Not 6 at a time like in the dark ages
