^^^ What they said, the *swf file automatically optimizes when you publish it. So the file that's going online only has what you need. It's not affected by what you put in the library, only what you use on stage or in your movie clips.
The only reason to delete material from your library is if you're running out of hard drive space. If you're library is becoming unmanageable, then it's time to rework your library folders so that it's better organized.
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