[FreeNX-kNX] Performance with KDE 4.8 + Qt 4.8
fcoiffie at gmail.com
Mon Jan 16 14:41:05 UTC 2012
Since first versions of Qt 4, the performance of this toolkit through
NX/FreeNX has decreased (compared to Qt3) : it slows to refresh and there are
Moreover, Qt 4 can supports different graphic backend :
- native which uses X11
- raster which makes many operations on an internal graphic buffer without
On a local machine, raster performs well but it is really slow with a remote
X11 or NX/FreeNX.
It seems that the next version of KDE 4.8 (associated with Qt 4.8) will select
raster by default.
I have found a workaround to keep raster on a local connection and to select
native with FreeNX (ugly hack) :
[ "$EXPORT_SESSIONID" = "1" ] && export NXSESSIONID="$sess_id"
+ export QT_GRAPHICSSYSTEM=native
More information about the FreeNX-kNX