Hi,

Are you sure it's CreateImage itself taking 2-3 minutes? If the delay comes from automatic layout code that runs before you export the image, you can call the ArrangeAsync methods of layout classes, available in .NET 4.5 builds of the assemblies.

Regards,
Slavcho

Hi,

What's your diagram.Bounds value at the time you click export? How many item in the diagram?

Regards,
Slavcho

A diagram with 500 nodes, 1000 links and your Bounds value exports for under a second in our tests, including saving the image to a file -

diagram.Bounds = new Rect(0, 0, 36498, 2320);
....

DateTime start = DateTime.Now;
var img = diagram.CreateImage();

Utilities.SaveImage(img, "D:\\diagramImage.png");

TimeSpan ellapsed = DateTime.Now - start;

diagram.BackgroundImage = img;
MessageBox.Show(ellapsed.ToString()); 

What kind of nodes are you using, and to what image format are you saving the image?

Our developer has just looked into this for adding to current release but sadly won't be available. Our measurements show the slowest part of CreateImage is the RenderTargetBitmap.Render call. There's a RenderTargetBitmap.RenderAsync method in the UWP framework which is missing from WPF, so we can't create async version in WPF control directly. We've also tried various Task and thread -based solutions but have problems with thread affinities there.

For time being try running image export as external process. E.g. you pass diagram's file name as argument to the child process, load a copy in diagram there and export, report export done to user once the process exits.

Regards,
Slavcho