From personal experience of slow running pro-e, framing screen, slow loading, etc. etc.. It was because my computer didn't have a fast enough processor or insufficient memory. After working with Pro-E for a year with this same computer, my employer purchased me a brand new Dell, since then, pro-e works wonderfully, that is unless I am loading a very larg assembly, a model with complex features, or alot of features. hope this helps somewhat in answering your question.
'Ryan'