imovie 09 really slow doing editing

what is wrong with my system? Imovie is using about 13% of the process in my computer, 85% of the cpu is idle. Imac desktop 2 GB ram 50 GB free space and the little color wheel keeps spinning for 10 min. or more just to do small small editing adjustments. It is larger movie file about 1 hr. long but I can't believe it should take so long to do editing.
Mel
 
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