Resizing QQuickWidget on Windows 7 is slow

#include <QtWidgets>
#include <QtQuickWidgets>

class View : public QWidget
{
    Q_OBJECT
public:
    View(QWidget *parent) :
        QWidget(parent),
        mView(new QGraphicsView(this)),
        mQuickWidget(new QQuickWidget(this))
    {
        setLayout(new QHBoxLayout);

        mView->setScene(new QGraphicsScene);
        mView->scene()->addEllipse(0, 0, 100, 100);
        layout()->addWidget(mView);

        mQuickWidget->resize(150, 150);
        mQuickWidget->setResizeMode(QQuickWidget::SizeRootObjectToView);
        connect(mQuickWidget, SIGNAL(statusChanged(QQuickWidget::Status)),
            this, SLOT(onStatusChanged(QQuickWidget::Status)));
        mQuickWidget->setSource(QUrl::fromLocalFile("main.qml"));
        layout()->addWidget(mQuickWidget);
    }
private slots:
    void onStatusChanged(QQuickWidget::Status status) {
        if (status == QQuickWidget::Error) {
            qDebug() << mQuickWidget->errors();
        }
    }

private:
    QGraphicsView *mView;
    QQuickWidget *mQuickWidget;
};

int main(int argc, char** argv)
{
    QApplication app(argc, argv);

    QMainWindow window;

    View *view = new View(&window);
    window.setCentralWidget(view);

    window.resize(400, 400);
    window.show();

    return app.exec();
}

#include "main.moc"