I believe it's of much more use on Macs with Retina Displays. I've definitely noticed improvements in general UI animations and scrolling in OS X.
Yes it does. Core Graphics and Core Animations (aka. 2D rendering and most of the OS X animations) now utilize Metal on supported Macs.That has nothing to do with Metal.
The GUI is only using Metal on certain weaker Macs with Intel iGPU only.Yes it does. Core Graphics and Core Animations (aka. 2D rendering and most of the OS X animations) now utilize Metal on supported Macs.
Yes it does. Core Graphics and Core Animations (aka. 2D rendering and most of the OS X animations) now utilize Metal on supported Macs.