The method: redraw each page as an image
A photo-heavy PDF is heavy because of the images it contains. The fix is to redraw each page at a lower resolution (72 to 150 dpi is enough for screens) and put it back into a PDF.
What you give up: selectable text
Since every page becomes an image, the text is no longer selectable or searchable. Great for emailing or a quick preview, not for a contract or a document to print at full quality.
What if the PDF is already light?
A PDF made mostly of text is already very light: turning it into images would only make it heavier. Keep it as it is.
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