I've tried the latest xpra+winswitch (1.0.2, 0.12.23) on ubuntu 16.04 but this was always the case also with previous versions. i've tried different video settings but even on grayscale and choose "low latency" the keyboard and screen still lags a little especially compared to using winswitch with NX. i'm using mostly in seamless mode , eclipse+terminal and in both NX is much smoother

This is far from ideal: we end up with 2 extra X11 servers (the Xvfb and Xnest running inside it) and performance is not going to be great. But this is fairly easy to add, so why not?

Server must tell the clients that it supports this mode (==it has Xnest installed and this is enabled in config). Then on app start we run Xnest and use the old port probing code to launch the real app against the Xnest display. (not going to do pre-launch mode for this - not worth it)

The flag is there, it's just not used at the moment.

I can't figure out the standard way to pass arguments to a setup.py script. Ideally, we could do:

./setup.py --no-server

And avoid building all the X stuff (which pulls zillions of dependencies)