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What is that? An unclosed path? I don't know enough about Cocoa path-drawing to tell, but it jumped out at me right away. More noticeable in motion. It’s not Cocoa, it’s OpenGL. performance on the watch and certain phone cases. Interesting! I'm surprised relative to eg shape layers. Thanks for info. Yep, it started getting impossible with the gradient stretching + overlapping behavior specced ah of course the gradients in particular do seem to demand a shader also try animating shape layers and cry shape layer edges are also messy. Remember how UITextField corners looked mid iOS 7?