Mysterious shrinking files

I have been burning a 14 gig movie to I DVD along with a slide show that has about 20 slides from jpegs exported from Keynote. The first few times I burned it I noticed the contents of the DVD were about 3.8 gigs. Now its 1.9. I have made only a couple minor changes to the slide show. I changed a couple slides and edited some text on them.
Any ideas why the file size has changed so much? I'm worried the qulaity will be lower. I have it set to best quality in the preferences. It may have been best performance before. Not sure
I also once exported the movie to QT to show at a trade show. It was 90 Mgs. I noticed the iMOvie package contents contains a QT file in the shared folder that is only 2 Mgs! It has the same apparent quality as the 90 meg version. The screen size is identical. I made a copy of it and think I may load it on my web site. This movie was so big that the web exports were tiny and huge.

On some of your topics:
1) The Quicktime movie in your iMovie project folder is a reference movie, useful for transfer to iDVD but dependent on the contents of the media folders for that project. It will not work independent of those files.
2) iDVD works based on the length of the movie, not on the gigabytes. iDVD compresses whatever you put into it which reduces the file size. But it sounds like you are right about the settings.
If the video is half as big, you may have reduced the compression quality by half.

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