[winswitch] xpra: high %cpu when start a background application

[Long Nguyen Thanh]

Hi all,
(sorry if my English is not good)
I'm using server Ubuntu 12.04 with xpra 0.14-1, client Windows 7 Pro with
xpra 0.14

Reproduce:
A.
1.At server: xpra start :100 --start-child=myapp --bind-tcp=0.0.0.0:20000
myapp is an application without GUI.
2. At client : xpra attach tcp:IP:20000
3. At server : top -> %CPU xpra ~ 10%
B.
1.At server: xpra start :100 --start-child=firefox--bind-tcp=0.0.0.0:20000
2. At client : xpra attach tcp:IP:2000
3. At firefox windows: Open some website ( youtube,...) and check :
%CPU ~ 25% - *75%*

So is it normal with those %CPU when use xpra?