iMovie finalize question?

when i've finished imovie projects want save in highest possible .mov format can watch on macbook, use ps3 video 9 convert ps3 readable .mp4 file, therefore don't see point in finalizing project saves file formats , assume tak more storage space. however, when going through imovie says:-

"when you’re finished creating project, can finalize it. process, imovie prepares (renders) movie in of possible sizes—mobile, medium, large, hd 720p, , hd 1080p—that project’s media supports. (sometimes, original project media isn’t large enough render in largest sizes.) don’t see finalized files in imovie; rather, imovie uses files when share project mobileme or social media website such facebook or youtube. when finalize project in advance, process of sharing movie takes less time.

finalizing project improves full-screen playback because imovie uses rendered files when play project in full-screen mode."

i'm interested in last sentence i've highlighted. mean playback through imovie improved, or see difference when playing saved file, and/or when playing on ps3?

cheers.

 

i don't know "finalisation" in imovie, when finish edit, export final sequence using editing codec template other applications.
in imovie go share > export using quicktime , click options

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and set apple intermediate codec , linearpcm video , audio.

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i had set size, source 1080p , imovie had selected 1280 x 720 output resolution.

 

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