Video playback terrible!

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I've just bought one of the brand new MacBook Pros (March 2011) which has it's own dedicated graphics card and 8GB Ram but still I find that HD video playback within Aperture 3 is unwatchable.
It starts and stops and if it works is very jittery.
Is this just how it is in Aperture?
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Replay

For what it's worth, I think the problem I was experiencing was because my video files were stored on an external hard drive connected to an Airport Extreme and I was trying to play those HD videos over wifi (which presumably isn't fast enough to stream HD video)