Jerky Animation (Video Link) - WHY?

I have a simple animation with two keyframes moving horizontally. However, the movement staggers or 'chugs' across the screen.
Look: http://img21.imageshack.us/i/staggeredvideo.mp4/
That's not the actual ad, but the same mishap occurs.
Set up
AECS3, 30fps (same result at 29.97fps)
Several layers attached to a null object
The null has two keyframes (regular *diamond* kfs - same result with varied easing kf types)
The null moves the objects in time across the screen from point A to point B
Result - Jerky movement
Question: Why?Is there a way to resolve this?
I asked the awesome folks on Creative Cow, but thought I'd seek assistance here as well. Thanks in advance!

I don't see any staggering - and that on a machine that is currently rendering a 3D animation in the background and has a processor usage of 90%. So in all fairness, what you see are most likely issues with your local computer configuration/ hardware performance.
Mylenium

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