QDeclarativeView animation stops in release build

[ephe]

I created a small application which just shows a spinning icon. I've created this animation in QML.

This is what my application looks like:
@
MainWindow::MainWindow(QWidget parent)
: QMainWindow(parent)
{
setFixedSize(600,440);
QWidget poWidget = new QWidget();
QVBoxLayout* poLayout = new QVBoxLayout();

QDeclarativeView* view = new QDeclarativeView();
view->setSource(QUrl("qrc:/img/SpinningIcon.qml"));
view->setViewportUpdateMode(QGraphicsView::FullViewportUpdate);

poLayout->addWidget(view);
poWidget->setLayout(poLayout);
setCentralWidget(poWidget);

}
@

@
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
@

If I run it in debug mode on the Blaze with Windows EC7, everything works fine. If I try to run it in release mode, it stops spinning after a while and the CPU load goes up to nearly 100 %. (before it stops, the CPU load is around 20 %)

Does anybody have an idea what the problem could be?
Thank you in advance!

[ephe]

It works when I change the settings of the QtGui project.
When C/C++ - Optimization - Disabled is set, everything works fine.

The other problem is that the cpu load of the release build is a lot higher than the debug build when I embed QML in C++. Without QML the cpu load is a lot lower in debug mode.

Does anybody have an explanation for this?

[ephe]

I found out that it is enough to only change the optimization settings of qblendfunctions.cpp

But I still do not have an explanation for that :(