I don't recall, so let me try. I have a 2.5MB (17 page) PDF of supplementary lecture notes that I've added "scribbles" to on 4 pages, and a little highlighting to on one page. Admittedly this isn't all that much. Exporting takes 7-8 seconds. For me this is fast enough, and I'm able to view the updated file in Adobe Reader without any problems.
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