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)

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

I updated from the PPA last week and noticed the html5 client no longer works. I just get an empty white screen instead of windows loading. I was able to fix this by copying the /usr/share/xpra/www folder from a system that had a prior working install on it.

A hint may be here:

Files www.broken/connect.html and www/connect.html differ
Only in www.broken: connect.html.br
Only in www.broken: connect.html.gz
Common subdirectories: www.broken/css and www/css
Only in www.broken: favicon.ico.br
Only in www.broken: favicon.ico.gz
Files www.broken/favicon.png and www/favicon.png differ
Common subdirectories: www.broken/icons and www/icons
Files www.broken/index.html and www/index.html differ
Only in www.broken: index.html.br
Only in www.broken: index.html.gz
Common subdirectories: www.broken/js and www/js