Playback Jumps as if processor is overloaded

I just uploaded an HD clip from my Sony HDR-HC3 camcorder in 1080i format at 29.97 fps into iMovie 6.0.3. I followed all previous trehead advice. Nevertheless when I play in preview mode or full screen, the video portio skips while the audio track plays smoothly. I took it into the store and a Creative transferred the file and it played fine. It creates the impression that iMovie and my processor are overloaded.
To test this further, I tried exporting the clip to QuickTime with a medium quality compression. It played continuously but the quality was poor and it took 20 minutes to compress a 22 second clip into 64MB.
How do I get iMovie to play without jumping? Sometimes I get a mesage saying "HD playback at 1/8 speed" but Help does not explain what this means.
Thanks for your guidance.
Patrick

Noticed it only happens on my secondary monitor; on the primary, it scrolls just fine. Got any ideas on how to fix this?

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