Originally Posted by westcoaststyle

http://www.adobe.com/designcenter/ac...7optimize.html

http://www.adobe.com/support/techdocs/321185.html

File > Reduce File Size. This command will resample and recompress images, compress the document structure and clean up elements such as duplicate background images or invalid bookmarks. If the file size is already as small as possible, this command has no effect.