Why do pdf files load slow

when I open pdf files in illustrator it is painfully slow. Can you tell what I should try to do?
Thanks,
Allan

they are approval templates we put designs in for clients. we make custom clothing. the file size can range from 1mb to 25mb. they are not that big i don't think, but they load terribly slow. there are lots of vector points in the templates but i don't know if they makes a difference. .ai and .eps files load fine of the art work. if i create a file and save it in .ai it opens fine. if i then save it in .pdf it takes a long time to save it and every time opening is slow too. there was a time when this was not the case and i have just put up with it.

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Every time Firefox opened
== unknown

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