Hi have You tried QGraphicsView::NoViewportUpdate. I found that this method brought me the biggest improvement when it came to my games FPS. I don't know what the scope of Your game is but if it runs using QGraphicsScene::advance() this might work the same way for You.
Ok now that I started to paint an nonblnak background NoViewportUpdate stopped being such a good idea. Please ignore my previous statement.
[quote author="danilocesar" date="1285421897"]For me, The best way to learn Qt is: read the examples and the "documentation":http://doc.qt.nokia.com/4.7/index.html[/quote]
totally agree, but sometimes I just feel it is so nice to just sit back and see some cool videos on Qt :)
gunnar has written several excellent articles about QGraphicsView and performance. Related to the topic e.g. "Qt Graphics and Performance - An Overview(Qt Graphics and Performance - An Overview)":http://labs.trolltech.com/blogs/2009/12/16/qt-graphics-and-performance-an-overview/ and "Qt Graphics and Performance - The Raster Engine(Qt Graphics and Performance - The Raster Engine)":http://labs.trolltech.com/blogs/2009/12/18/qt-graphics-and-performance-the-raster-engine/.