Or maybe the number of images you have. Have you optimized all images (Utilities menu). If you have a lot of images that were imported at high resolution, this can eat up memory. When you optimize the images, then close and reopen the document, all images will not be optimized to their current size.That's good to know. It might be the number of pages but I suspect the delay is caused by something on those pages that v. 15 is struggling with. Perhaps something having to do with links or placeholder code.
In my example the top photo is 3.7 MB and the resolution at 1508 dpi. The photo optimized to 150 dpi is 74 K. So if you multiply this savings for all images in your site the savings in memory can be substantial.
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