I came to this topic after I had reverse engineered several large Java modules into my model, after which, editing diagrams had become very slow and tedious. Even selecting a shape in a small diagram exhibited delays of up to 20 seconds. For anyone who may have similar issues, I can verify that one of the suggestions given here by Rain really helped me.
Although most of the imported objects were in a nested Model, the data entities, (about 100), that were imported were all at the root level. I created a new Model and moved those entities into it, saved the file and restarted VP. That seems to have done the trick. I can now edit diagrams without any noticeable delay.
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