Why does importing a .Mov file almost triple it's file size?

I have a Kodak Zx1 which is not recognised by iMovie (Kodak's fault I assume as there are no drivers etc. available for the Mac).
To get my movies into iMovie I download them onto the Mac hard drive and then import them into iMovie 09 using "Import" - "Movies from the "file" menu. I then opt for "optimize video" - and "full-original size". The files import with no problems but almost triple in size...eg 29meg to 84meg....does anyone know why?
Incidentally not ticking the "optimize video" option does import the movie with an identical file size .... however.... the movie playback is very jerky in the movie viewer pane ...again, does anybody know why?
Thanks in advance everyone.

does anybody know why?
In simple terms, in order to edit your footage, iMovie needs a certain amount of data about each frame.
In the compressed form stored on the all the necessary data isn't present, so the missing pieces have to be filled back in to allow you to edit. This process increases the file size.
Once you've edited your movie it can then be re-compressed.
Matt

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