Dragging of the item in QTableView or QTreeVIew works very slowly on Mac OS

#include "dialog.h"
#include "ui_dialog.h"

#include <QTableView>
#include <QHBoxLayout>

class Model : public QAbstractTableModel
{
    public:

        Model( QObject* parent )
        :
            QAbstractTableModel( parent )
        {

        }

    public:

        int rowCount(const QModelIndex & parent = QModelIndex()) const
        {
            return 5;
        }

        int columnCount(const QModelIndex & parent = QModelIndex()) const
        {
            return 5;
        }

        QVariant data(const QModelIndex & index, int role = Qt::DisplayRole) const
        {
            if( role == Qt::DisplayRole )
            {
                return "test";
            }

            return QVariant();
        }

        Qt::ItemFlags flags( const QModelIndex&	index ) const override
        {
            return QAbstractTableModel::flags( index ) |
                    Qt::ItemIsDropEnabled |
                    Qt::ItemIsDragEnabled;
        }

        Qt::DropActions supportedDropActions( void ) const override
        {
             return Qt::CopyAction;
        }

        bool canDropMimeData(
            const QMimeData*	data,
            Qt::DropAction		action,
            int					row,
            int					column,
            const QModelIndex&	parent) const override
        {
            return true;
        }
};

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);

    QTableView* table = new QTableView;
    table->setModel( new Model( table ) );

    table->setSelectionBehavior( QAbstractItemView::SelectRows );
    table->viewport()->setAcceptDrops( true );
    table->setDropIndicatorShown( false );
    table->setDragDropMode( QAbstractItemView::DragDrop );

    QHBoxLayout* layout = new QHBoxLayout;

    setLayout( layout );
    layout->addWidget( table );
}

Dialog::~Dialog()
{
    delete ui;
}