Jerky playback of video clips in iMovie

Just purchased a Sony Handycam (DCR-SR37E), and the movie playback is very jerky: the red line doesn't flow smoothly through the clips and the playback correspondingly jumps about. The sound is unaffected - it plays back smoothly.
Is this a problem with the computer being too old and slow (iMac G5) or is it a Sony vs Mac issue?

Wow- what a pain!! Just got the brand new MacBook ($999 version) for Christmas, and edited movie in iMovie 09....When I play it certain clips are extremely jerky on playback when I try to convert to youtube or quicktime...Latest Leopard OS- Flip Camcorder...So, basically, the Christmas video is ruined- even though the actual clips are fine...And its strange, because on playback different clips are jerky at different times...Anyone????

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