The Arrival of NX, Part 3 (Linux Journal)
Before, we asked, "How important is round-trip elimination?" Now that you understand the basics of how X works across the network, the importance of being intolerant towards unnecessary roundtrips is obvious to you. You now should be aware of how much the latency of any link, especially a slow one, weighs in to make a remote connection feel slower with every additional roundtrip that takes place. Every roundtrip saved is a little boost for GUI responsiveness."
