If your document has track-changes 'on', it would now have both the originals and the updates. Also, if the originals had been compressed in Word, their resolution would have been no more than 220dpi. Your replacement images may be more than that if Word hasn't compressed them - and if it does you'll be back to what you had before...



For speed of editing with multiple graphics, check Word's 'Show picture placeholders' option (Word|Options|Advanced>Show Document Content). You'll still be able to see where the pictures are, but Word won't spend time rendering them.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]