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Remote Display Protocols
On a high bandwidth, low latency network, X11 actually works pretty well
Main interesting optimisation point is reducing roundtrips – fix the apps, use a proxy server?
On lower bandwidth, higher latency networks, VNC works better because the client rate-limits the server
On these types of networks, NX has also been shown to do well when a proxy server is used
Another interesting difference between X11 and VNC is where the display state is maintained – with X, its all on the client (i.e. the Xserver) and with VNC the client maintains no state