This is actually one area where I like our IBM i system, the 5250 console may be extremely lacking in many features compared to say a VT100, but the block-based console eliminates the remote server from needing to handle redrawing or dealing with input until the user explicitly requests an action. It's pretty amazing to see a thousand users connected to the box and none of them have any latency with inputting data (getting a new screen back from the server make take a couple milliseconds) because it's all done locally until they press a function key or some other action button that pushes the data off to the server.
