Laptop screen plays back jumpy video, CRT looks fine

I have a strange problem:
When I play back video from FCP (6.0.6) in either the canvas or the viewer and the window is entirely on my laptop screen, it looks jumpy, sort of like if the playback frame rate was set to dynamic. If the window is even partially (like 10%) on the CRT, the playback is fine. The jumpiness goes away if I set the playback quality to Medium.
I have been editing with this setup for a year or so and only recently noticed this. I've recently upgraded to Snow Leopard, but FCP is still 6.0.6. Is this a Snow Leopard / FCP version problem? It seems odd that it would only exist on my laptop's LCD screen and not my CRT.
System Details:
I have a 2.6 Ghz Macbook pro with 2gb of ram. The DVI out is connected to an old LaCie Electron Blue 22" CRT. I typically edit with both screens, usully putting the canvas on the laptop screen and the viewer on the CRT. My playback framerate is set to full and video quality set to high. My capture scratch drive is an OWC Mercury Elite Pro set up as a RAID 0 and connected via Firewire 800. My sequence setting is ProRes 422 1440x1080 and the footage was shot with a Canon XH A1. Some was captured as ProRes and some as HDV, but the problem happens with both kinds of footage.
Any thoughts?
Thanks,
- Bruce

I suppose that makes sense. I do wonder, though, why it would have this weird behavior where it only does it if the entire window is on the laptop screen. If just a little sliver of it is on the CRT, then it's fine. Also, why would it prioritize the performance of the second display over its main display?
Is there any way to boost the graphics card performance? Would more RAM take some of the pressure off the graphics card, or are the tasks strictly separate?

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Laptop screen plays back jumpy video, CRT looks fine

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