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Tweener.ClutterFrameTicker — Object used internally for clutter animations
The 'FrameTicker' object is an object used to feed new frames to Tweener so it can update values and redraw. The default frame ticker for Tweener just uses a simple timeout at a fixed frame rate and has no idea of "catching up" by dropping frames.
We substitute it with custom frame ticker here that connects Tweener to a Clutter.TimeLine. Now, Clutter.Timeline itself isn't a whole lot more sophisticated than a simple timeout at a fixed frame rate, but at least it knows how to drop frames. (See HippoAnimationManager for a more sophisticated view of continuous time updates; even better is to pay attention to the vertical vblank and sync to that when possible.)