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For any interested... here is how Bing translated this message: I'm in a mechanical design, engineering drawings often include hundreds or even thousands of parts of engineering drawings, 4.0 works less than 4 m size, and 5.0 of engineering drawings have 100 m, open and save to a few minutes and 4.0 as long as 3 seconds there, PROE 5.0 F000 engineering drawing how worse, I do not know which expert to know why? Probably not accurate, but maybe someone can make some sense of it?