Hi,

SvgNode was intended for showing icons in the diagram and doesn't do any caching of render results at this time. A large SVG drawing would cause multiple calls to RenderContext's draw-primitive methods when node's coordinates change, and will generally create large WPF visual tree slowing down screen refreshes.

You could try caching SVG renderings yourself by creating RenderTargetBitmap from SvgNode, and then only drawing the bitmap using a transparent ShapeNode or a custom type:

var bounds = new Rect(0, 0, 400, 200);

var svgRenderer = new SvgNode
{
	Content = SvgContent.FromFile("source.svg"),
	Bounds = bounds,
	Transparent = true // hide shape geometry
};

var cache = new RenderTargetBitmap(
	400, 200, 96, 96, PixelFormats.Default);
var visual = new DrawingVisual();
var context = visual.RenderOpen();
svgRenderer.DrawLocal(context, diagram.PrintOptions);
context.Close();
cache.Render(visual);

var node = new ShapeNode
{
	Image = cache,
	Bounds = bounds,
	Transparent = true // hide shape geometry
};
diagram.Nodes.Add(node);

// todo: refresh cache when node resizes, but maybe only
// when scale changes substantially to not redraw very often 

Regards,
Slavcho
Mindfusion

Thank you!