Code

var now = DateTime.Now;
diagram.ValidityChecks = false;
diagram.BeginInit();
for (int i = 0; i <= 1024; i++)
{
	ShapeNode srcNode = createNode(new Rect(100, 100 + i * 40, nodeWidth, nodeHeight));
	ShapeNode snkNode = createNode(new Rect(400, 100 + i * 40, nodeWidth, nodeHeight));
	DiagramLink link1 = new DiagramLink(diagram, srcNode, snkNode);
	diagram.Links.Add(link1);
}
diagram.EndInit();
diagram.LinkCrossings = LinkCrossings.Cut;
Debug.WriteLine(DateTime.Now - now);
 

Code

BitmapImage encoderImage = new BitmapImage(
	new Uri(@"..\..\Encoder.png", UriKind.RelativeOrAbsolute));
Color shadowColor = new Color { ScA = 1, ScB = 0, ScG = 0, ScR = 0 };
DropShadowEffect dropShadow = new DropShadowEffect {
	RenderingBias = RenderingBias.Performance, ShadowDepth = 8 };

private ShapeNode createNode(Rect rect)
{
	var mainNode = new ShapeNode { Bounds = rect };
	diagram.Nodes.Add(mainNode);
	// ...
	mainNode.Image = encoderImage;

	// ...
	var lr = new Rect(mainNode.Bounds.X - mainNode.Bounds.Width, mainNode.Bounds.Y,
		mainNode.Bounds.Width, mainNode.Bounds.Height);
	var lableNode = new ShapeNode { Bounds = lr };
	diagram.Nodes.Add(lableNode);
	lableNode.AttachTo(mainNode, AttachToNode.MiddleLeft);

	// ...
	mainNode.Effect = dropShadow;

	return mainNode;
} 

Code

lableNode.TextFormat.Alignment = StringAlignment.Far;
lableNode.TextFormat.LineAlignment = StringAlignment.Far;
lableNode.TextFormat.FormatFlags = StringFormatFlags.DirectionRightToLeft; 

Code

lableNode.TextFormat = new StringFormat
{
	Alignment = StringAlignment.Far,
	LineAlignment = StringAlignment.Far
};