Nonsense - explain Expose running without dropping frames on a G4 with 256 MB of ram shackled to a spinning disk? Even if we need to quadruple the memory required since modern systems have retina displays that is still only 1GB of memory so obviously the quality of animation engineering has gone down or something else in the process is failing...The A12Z in the Developer Kit had 16GB of RAM, the A12Z in the 2020 iPad Pros has 6GB, that's the key difference.