Since I only have EDGE for cellular connection nothing will make that snappy, but when I use it on wifi if I take over moving the mouse from my PC, the screen scrolls accordingly on my iPhone. If I click on something the screen updates more quickly and reliably than it did in Mocha VNC. I like the feel of scrolling, clicking, etc much better on Teleport.
I think it may have some stability issues as a first release, it has crashed out to the springboard a couple of times on me but it's a very impressive program in any case.