you did a great work with graphsharp and it helped me much.
Currentlly I have a tree with appr. 50 verticies (normal tree with 1 parent/2-3 Children) and panning is normal if the zoom factor is 1.00.
But if I zoom in to factor 6 (or more) it is getting extremly slow and the cpu load will jump to 100%. If I set the zoom control slider to max, the app is nearly stopping.
Does anyone has an idea what this could be?