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There are two ways to produce a sequence diagram. For large diagrams, Method 1 below (normal method) takes about half the time, and produces a diagram that is about 10 times wider than Method 2. Method 1. This is recommended in the help. Right-click on the required operation in the dependency diagram. Approximately half of the total time is now taken up waiting for the dialog to launch. The spacing between each object can be 10 times the label width of a typical object. Method 2. Proposed by petersl. Right-click on the operation under "Operations" in the model tree. The dialog is launched instantaneously. The total time taken from clicking on the operation is 2-3 times longer. The diagram objects are reasonably spaced with a separation of approximately one-third of the label width of a typical object. I suggest that in the normal method (Method 1), the dialog should be launched instantaneously. I don't think it's normal UI practice to do a lot of work before launching a dialog. After all, the user may decide to cancel when the dialog appears, so the initial work is wasted. I would like to see the diagram width to be the same (and as narrow as possible) in both cases.
some changes was made in re-op creation, so may be initiaql issues are resolved now, but without "bad" sample it's hard to say certainly