Rectangle drawing was slow, especially after more than one rectangle was drawn, because after each mouse move, when drawing the preview rectangle, the seven constraints were added, as well. I've updated the code so that during drawing the lines are drawn, but the constraints are added only once.
Here is a comparison, where I drew rectangles with the old version - the delay in drawing starts after the fourth rectangle is drawn. In the new version, there is no such delay (the message box is about the tree view, an issue I'll be working on soon):
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