Scanned PDF's leave a lot of extra data in them that can cause slow printing. If the customer has access to a full version of Acrobat, they can save the file as a reduced size PDF, which will clean the file up.

I've also seen printing the file at a lower resolution work as well. Upscaling a 200 to 300 dpi scan to a 600x600 or 1200x1200 print job can be tough.

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