Embedded Files
Check the file size of your document?
Finder > select the file > anything over 1 to 5 MB will be slow, especially and image file. (There are 1024 KB in a MB so a 500 KB file is 1/2 or .5 MB's. )
How do I optimize file size?
Open the PDF with Preview (Mac) and File > Export > Quartz FIlter (drop-down) > Reduce File Size > Save
Image File (png, jpeg, tiff, etc.)
Open the PDF with Preview (Mac) and File > Export > File Format > choose jpeg
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