QQuickPaintedItem update slow on Windows 7 Classic & Basic themes

[dasun]

Yes, it's strange. I guess Windows 7 Classic and Basic themes has low rate of screen redraw cycles. Sometimes it takes about 5 seconds to update custom QQuickPaintedItem visually on screen. I'm calling update() too. This want happen if I'm using rich theme like Windows 7 default theme. What can I do to overcome this? Is there a way to force update the QQuickPaintedItem ?

I tried to recreate this by creating small program which only contain one custom QQuickPaintedItem and few QtQuick Controls. It worked as expected, no delays. My application somewhat rich and have handful of components in the display.

I'm using Qt 5.2 Beta.
QtQuick.Controls 1.1