I found my blog post on CA again and published it at the link I gave with my name.
It should describe the problems I was seeing with responsiveness in more detail. As I said before this is not about the number of layers but rather about latency which seems to be a bit bigger with CA than with direct drawing.
As I said before, I don't doubt that CA can wiggle big numbers of pixels around. I just said that I didn't find it better than direct NSView drawing when interaction comes into play. UI wise I consider the cases with direct interaction to be the important ones as pretty flying animations and screensavers aren't what makes a computer useful to most people.
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