QCView has setMaxRenderingFrameRate: but QCCompositionLayer has no such equivalent call that I can find. I am guessing there might be an attribute to be set with setValue:forKey: but I can find no reference to this.
If there were such a property, it would be on QCCompositionLayer's super class, CAOpenGLLayer or CALayer. I'm not aware of a way to modify the framerate of a layer backed view, much less a single layer. CoreAnimation runs at the best frame rate it can, asking its layers to draw if they need to and in Leopard, QC will accept every request to draw.
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