I just add 

setAttribute(Qt::WA_OpaquePaintEvent); 

and comment

setAttribute(Qt::WA_PaintOnScreen);
setAttribute(Qt::WA_NoSystemBackground);

and flicking disappear under win XP... QT doc talk about systems that doesn't 
support double buffering, so no double buffering under xp ??? so strange...

So now no flicking, but still very slow app.

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