In fact, to do 20,000 messages (10,000 in each direction) takes about 21 seconds on my home machine. To do it through the slow firewall connection at work it take about 25 seconds. There is hardly a difference. It is amazing. I am thinking that you will hardly be able to tell that you are running an application across the network.
I can not wait to finish integrating it with my application browser and see what it looks like visually.