QListView::setRowHidden() is very slow when hiding large numbers of items

#include <QtGui>

QList<QModelIndex>myList;
class ListView : public QListView
{
	Q_OBJECT
public:
	ListView()
	{
		QStringListModel *myModel = new QStringListModel(this);
		QStringList list;
		for (int i = 0; i < 50000; i++) {
			list << QString::number(i);
		}
		
		myModel->setStringList(list);
		setModel(myModel);
		QTimer::singleShot(3000, this, SLOT(test1()));
	}
	public slots:
		void test1()
		{
			setUpdatesEnabled(false);
			QTime t;
			t.start();
			for (int i = 0; i < 30000; i++) {
			setRowHidden(i, true);
			}
			qDebug() << t.elapsed();
			setUpdatesEnabled(true);
			

		}
private:
	QSortFilterProxyModel *myProxy;
		
};

class TreeView : public QTreeView
{
	Q_OBJECT
public:
	TreeView()
	{
		QStringListModel *myModel = new QStringListModel(this);
		QStringList list;
		for (int i = 0; i < 50000; i++) {
			list << QString::number(i);
		}
		
		myModel->setStringList(list);
		setModel(myModel);
		QTimer::singleShot(3000, this, SLOT(test1()));
	}
	public slots:
		void test1()
		{
			setUpdatesEnabled(false);
			QTime t;
			t.start();
			for (int i = 0; i < 30000; i++) {
			setRowHidden(i, QModelIndex(), true);
			}
			qDebug() << t.elapsed();
			setUpdatesEnabled(true);
			

		}
		
};

#include "main.moc"

int main(int argc, char** argv)
{
	QApplication app(argc, argv);
#if 1
	ListView window;
#else
	TreeView window;
#endif
	window.resize(100, 50);
	window.show();
	return app.exec();

}