I'm wondering if there are any client side performance issues with AJAX due to the client side scripting.
What I'm getting at here is the use of AJAX in a terminal services environment, if all of the client side scripting is taking place on a terminal server, would that not eventually bog down the terminal server?
I had to double check your question because initially in my response I ran on about this how if performance were an issue we would not be talking about Java. But then I reread your question and saw what you were really asking.
If you plan on deploying Ajax applications on a terminal server I would do it under very controlled circumstances! Things could get very quickly out of control, especially if you let the operators "surf".