Hi,

Set a breakpoint in diagram's invalidate method to see what triggers repainting for you. Usually it should be a single repaint for a set of diagram changes. E.g. if you add this code to AnchorPoints example, it will print 'repainting' only when you point a node with the mouse to show the auto-anchor marks, or click to show selection handles -

$(document).ready(function (sender, args)
{
	var originalRepaint = Diagram.prototype.repaint;
	Diagram.prototype.repaint = function()
	{
		console.log("repainting");
		originalRepaint.apply(this);
	}
	var originalInvalidate = Diagram.prototype.invalidate;
	Diagram.prototype.invalidate = function(rect, force)
	{
		console.log("invalidating");
		originalInvalidate.apply(this, [rect, force]);
	}

    // create a Diagram component that wraps the "diagram" canvas
    //diagram = MindFusion.AbstractionLayer.createControl(Diagram, null, null, null, $("#diagram")[0]);
    diagram = MindFusion.Diagramming.Diagram.create(document.getElementById("diagram"));
 

Repaint sequence looks like item.setProperty -> item.invalidate -> diagram.invalidate -> window.requestAnimationFrame -> diagram.repaint. requestAnimationFrame makes multiple invalidate calls compress into a single repaint. So if you are seeing repaint calls without user interactions, make sure you aren't changing property values from custom-drawing code or from timers.

Regards,
Slavcho
Mindfusion