QGraphicsItem Jerky Movement?

[steadi]

Hello there,

I am trying to make a qgraphicspixmapitem move with the arrow keys. It works to some degree, however, there is a minor delay when switching keys and it becomes slightly jerky. Is there a way to fix this?

Here is the code for moving (You can simply ignore the lua parts):

QList<QGraphicsItem*> temp = luascene->items();
    foreach(QGraphicsItem *itm,temp)
    {
        if( Sprite * node = dynamic_cast<Sprite*>( itm ) )
        {
            if (node->name == tempname)
            {
                node->setPos(node->x() + dir, node->y());
            }
        }
    }

QList<QGraphicsItem*> temp = luascene->items();
    foreach(QGraphicsItem *itm,temp)
    {
        if( Sprite * node = dynamic_cast<Sprite*>( itm ) )
        {
            if (node->name == tempname)
            {
                node->setPos(node->x() + dir, node->y());
            }
        }
    }

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Thanks in advance guys,
Matt