Note. . This question is not about the size of the views in the running application. This is strictly about the size of the canvas navigation manager view in Interface Builder.
This image illustrates the behavior of the problem in Interface Builder.

I did not find a way to reduce the performance of the navigation controller. As you can imagine, an iPad application with a lot of navigation controllers in a lot of Popovers causes the Storyboard canvas to become very crowded.
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