For CALayer.shadowPath “Specifying the path explicitly using this property will usually improve rendering performance”. When does it not?
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If the path is extremely complicated, it'd take more time to rasterize than the offscreen drawing pass.
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thanks and a related follow up, is there any benefit if the view is a simple opaque square?
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Oh, wait, I totally lied. Square-with-corner-radius is not on a special fast path for shadows; just for masking. Sorry!
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