[solved] QML Linux performance issues

[Schneidi]

Hey guys,

I'm usually developing under Windows but of curse I wanna have system independent software.

From time to time I'm testing my software on my openSuse system to ensure that it still works.
A friend of mine said he tested a qml based project on his ... I guess it is a Linux Mint system
and told me that he has some serious performance problems with the qml UI.

To validate this I have tested it under my suse system and it definitely hase some problems.

For example:

I have a ListView in my UI which show image data and stuff I animate the hole thing.
I developed it on my windows 7 system on a pretty old machine with less performance.
And it runs pretty good now I've tested the same application on my linux system with
Intel Core 2 Quad which has a lot more power than my windows machine.

But the ListView itself and other animation run totally stuttering. It seems that the software
runs on a system that has to less performance to calculate the animations fluently.

Is this a known problem ?

Does anybody had made the same experience ?
What could cause this kind of issue ?

thanks for help

[mbrasser]

Hi,

If you haven't seen it already, "this page":http://doc.qt.nokia.com/4.7/qdeclarativeperformance.html provides some hints for getting the best performance out of QML. Particularly important for X11 is the graphicssystem used: you will need to use "raster" rather than "native" for QML to perform acceptably ("raster" is default if you are using qmlviewer).

Regards,
Michael

[Schneidi]

Hey guys, your are so great this actually solves the problem at the first sight.

I called

@QApplication::setGraphicsSystem("raster");@

before calling the QApplication constructor.
Now I get a pretty good performance on my Quad processor maybe I have validate this on
a weaker system, but I guess this should solve the performance problems we had.

Thanks mbrasser I already knew this page but I just forgot to consult this one ^^