Publishing file sizes Q

ok the question is weather a published flash movie contains all the files and images in the library or just the ones that are used in the timeline. I have one file that has a whole lot of images in it and the .fla file size is around 900k, not to big but when I copy and paste the frames from the main timeline into a new .fla file only the images used in the timline transfer to the library and the file size decreeses to about 300k. This seems better but tedious, especially since the file size of both the .swf and .html published files from each .fla file is the exact same.
Anyone… I just want to be sure that the load time is as short as possible.
thx
erok