QT choppy, iTunes and Front Row fine

I have a Core Duo iMac, 2 GB RAM, and QT Pro, with all software up to date.
Movie files play back beautifully at full screen under iTunes and Front Row. The same files show horribly choppy video when played back at full screen using QT Pro. Audio is fine regardless.
Video files in question include DVD slideshows intended for TV and authored on my Mac, home movies made with digital cameras, and handbrake .mp4s coded with a wide range of quality settings and resolutions, from very undemanding to demanding.
Why doesn't QT Pro work properly at full screen? That is, is there something wrong with my software or hardware, or is this just a QT Pro bug?
Thanks for shedding any light.

Chris, appreciate the reply, but I think you may have posted into the wrong topic...

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