why am I getting the unresponsive page message when editing?

Whilst editing a page.... something that should take a couple of minutes now takes ages because things seize up, and I get a message that says... "the page is unresponsive. Do you want to wait or exit?" 

Does anyone have any clues.... Is the page to "big"... Should I archive a heap of stuff? I can't think of anything else.

thanks 

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