[Qt-qml] on device performance

[Cornelius Hald]

> If you aren't doing so already, I'd suggest also:
> * running using the raster graphics system (i.e. raster + GL viewport). This has an impact because so many of the items cache their drawing to pixmaps.
> * turning off sample buffers (below is what we do in qmlviewer), as long as the graphical results are acceptable to you
> 
> QGLFormat format = QGLFormat::defaultFormat();
> format.setSampleBuffers(false);
> QGLWidget *glWidget = new QGLWidget(format);
> //### potentially faster, but causes junk to appear if top-level is Item, not Rectangle
> //glWidget->setAutoFillBackground(false);
> view->setViewport(glWidget);
> 
> * As mentioned in an earlier reply, running fullscreen rather than maximized if possible (compositing is quite expensive, and avoiding it gives a very nice performance bump)

Thanks for the tips! Are there any similar optimizations that can be done for Symbian^1 and Symbian^3 devices?

Cheers,
Conny