Metal provides low-level access to 3D graphics, rendering and compute features in GPUs. With the deprecation of OpenGL and OpenCL, it’s vital, especially for M1 Macs/
Quartz
Six different PDF documents, all scrolling in unison when one pages through its thumbnails. Not a special effect – a bug in macOS Mojave.
A close look at just what macOS PDF support and Preview can do well, including a hidden file conversion feature.
The Eclectic Light Company 