About linking to the same file... what does the Links palette look like. Is there only one header row, with the total number of links, like this:
[Image from CS4]
... or is there one link per placed object? If so, do the links look the same?
As far as I know, and if I understand your question correctly, the links in InDesign are "soft", unless the images are actuelly pasted into the document - then they would have no link to image on disk.
Message was edited by: Andreas Jansson
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The undo functionality can probably not be turned off, but have a look at this thread: http://forums.adobe.com/message/2233313#2233313 and especially Harbs's comment about using doc.documentPreferences.pagesPerDocument instead of looping. I think that will help you a lot).
Before I was looping on document.pages.add(), switching to pagesPerDocument sped things up quite a bit.