The master compositor of windows, WindowsServer is a key part of the GUI which runs from when the login window appears until your Mac shuts down.
Metal
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/
This vital service composites individual windows to form what will be displayed, and routes clicks/taps to the correct app.
Fire up your eGPUs, engage Dark Mode, and open Xcode: our Macs are once again going to be at the centre of invention and reinvention.
It looks much the same as Sierra. Looking at High Sierra’s logs, though, shows that there are significant internal changes. Here’s a first glimpse at SkyLight, APFS and dasd at work.
Working with vector graphics is quite different from pixel-based or image formats.
The Eclectic Light Company 