Hi,

What Internet Explorer version are you using? We are not aware of any IE-specific problems, but since its JavaScript interpreter is slower than other browsers, you might try turning off some graphics elements if you detect it, e.g. hide the alignment grid, do not apply effects, do not show the Overview control, etc.

Stoyan

What do you mean by refresh, is it reloading the whole page after post-back, or just drawing on the diagram? The Canvas element is backed by a bitmap, which might require a lot of memory if it's several screens wide and high. If your diagrams are large, try setting the DiagramView.VirtualScroll property to true in order to keep the Canvas bitmap small.

We are not sure if IE actually reallocates the bitmap when changing canvas size from larger to smaller, which happens when you enable VirtualScroll. If it does not, it might keep using the large bitmap, and not freeing it after refresh is probably a memory leak. Try the following as a work-around:

- set a small Diagram.Bounds before submitting to browser from server
- add a ControlLoadedScript handler
- call setVirtualScroll(true) from it
- only then set large diagram.Bounds, e.g. by calling resizeToFitItems or setBounds(fixed size).

function onLoaded(sender, args)
{
    sender.setVirtualScroll(true);
    sender.setBounds(new MindFusion.Drawing.Rect(0, 0,5000, 5000));
} 

I hope that helps,
Stoyan