[winswitch] windows xpra client CPU usage

Antoine Martin antoine at nagafix.co.uk
Thu Nov 17 02:27:16 GMT 2016

On 16/11/16 22:41, Thomas Esposito via shifter-users wrote:
> My Xpra-Launcher.exe process is ALWAYS using from 5% to 10% of my CPU
> capacity, even when my X applications are TOTALLY idle (i.e. windows are
> out of focus and/or no redrawing from X clients).
My guess is that sound is enabled, sound forwarding uses a stream and
will consume network and CPU even when no sound is being played.

> This is a HUGE increase in CPU usage (and heat generation) on my laptop
> relative to when I'm just doing simple browsing and email. For example, if
> i'm just browsing and reading/writing email, my total CPU usage stays under
> 1% to 2% and the laptop stays cool with the fan off. If I add the Xpra
> client to this, even though I'm not interacting with the X application
> windows and they are not redrawing, my laptop starts getting hot and the
> fan turns on. Note this is only with a single X application window running.
Without sound, there should not be any network or CPU usage unless the
application's window is refreshing.
(bar ping packets every few seconds, but those are tiny)

> In comparison, the TigerVNC viewer and x2go CPU usage is effectively 0% if
> the windows are not updating.
TigerVNC does not do sound, or printing, and many other things!


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