This is an old post, but I'd like to bump it as opposed to just creating a duplicate.
This is a serious problem for people trying to write real-time applications in Flash. I'd really, really love to be able to specify TCP_NODELAY, but that's obviously not exposed anywhere. As a result, my system looks extremely "jumpy" to end-users due to Nagle buffering issues (I can obviously fix this just fine server-side, but if I want to stream real-time data from the user, e.g. mouse position, dragged objects, then everything will look extremely bad).
Does anyone know a way around this?