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Qt QGraphicsScene slow adding items
int w = 5;
int h = 5;
//QRect r(0, 0, w*1680, h*800);
//scene->setSceneRect(r);
//scene->setBspTreeDepth(5);
//scene->setItemIndexMethod(QGraphicsScene::NoIndex);
QTime t;
for(long i = 0; i < 800; ++i) {
    t.restart();
    for(long j = 0; j < 1680; ++j) {
        QGraphicsItem *item = scene->addRect(j*w, i*h, w, h, pen, brush);
        item->setFlag(QGraphicsItem::ItemIsSelectable, true);
    }
    qDebug() << "Elapsed Time: " << t.elapsed();
}
//scene->setItemIndexMethod(QGraphicsScene::BspTreeIndex);
setScene(scene);
//setSceneRect(0, 0, 200, 200);