Basic Question: why does exporting Movie take so long?

I import an hour long H264 640x480 movie into imovie. It takes about eight minutes.
I then add a few chapter markers. That's all I need to do.
Then I export as a large movie, also H264. It takes four hours.
So why does it take so long, as it is the same format? Is it just because the size is a a little different? Is there any way to export the movie at the same size as it was originally? Then would it export more quickly?
Thanks.

TimK wrote:
… What is a res?
I assumed that imovie did support h264, as up to now it has been exporting all my movies as h264 by default.
ooops, sorry: res=resolution
iM is meant for Camcorder imports - those trigger the import routines: .dv gets 'cloned' into Events, HDef gets converted into the AppleIntermediateCodec ... which offers the two (three) standards 1920x1080, (1440x1080/anamorph for HDV/'HDef on tape' sources) and 1280x720 ...
The EXPORT codec h.264 isn't meant for editing, but optimized for playback and file-size.
technically, a AVCHD/mts IS h.264
but to avoid technical probs, Apple prefers to transode into intermediates, aic.mov for consumer editor, proRes for FCPX ....
there's playback-codecs and edit-codecs ... for instance, playback-codecs (mp2, h264, Sorenson, VP6 etc) do not store every frame ( ! ) to reduce file-size; now, you like to edit with frame precision ... what shall happen?
an edit-codec contains any solid frame ... = file-size mucho bigger ...

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