Video stutter - mini vs macbook - not audio related?

Hi everyone - I've posted a couple of times now but for background, I am a new Mac/iMovie user and have just returned from an extended vacations where I created several projects using a Canon HV-10 for HD video. My projects play fine (for the most part) on my new MacBook (2.0 Gig processor) although I have experienced a limited number of video stutter issues. I've read the previous discussion threads but I dont think (?) they apply in my case as one of my projects doesnt have any "added" audio clips, and the other projects only have 2 or 3 songs added to the soundtrack. The videos still seem to "catch" or hesitate at specific clips but they dont do it all the time. More importantly, I just returned home and have attempted to play the projects on my mini (minimum configuration) and it both hangs up and when it does play, the frame rate is noticably slower than on the MacBook. I guess my question is, is there a fix for each of these cases? Also - if the Mini issue is insufficient hardware, is it likely the processor speed or can it be fixed or improved by just adding RAM? Thanks for your help.
Scott
mac mini, macbook Mac OS X (10.4.8)

If the stutter you see is related to the audio, it can be caused by 1) the number of audio clips; or 2) the songs added to the project. Even one or two songs can cause a problem, if they are the right (wrong) songs.
See this topic, which describes how to fix the songs:
http://discussions.apple.com/click.jspa?searchID=-1&messageID=4202842
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