[dakial1]

It it software. As they did to ios, the MacOs has highest priority to all interface actions.That's why the scrolling on ios and MacOs is usually very smooth. The interface get the highest priority so if the computer is struggling with lots of simulaneous processes, the interface still will feel smooth. Very smart solution to prioritize UX. Why they didn't do the same on windows/android? No idea.

[dmt0]

Also good defaults. In fact they don't even have certain settings in MacOS. For example you can't change the pointer acceleration, but the default one is just perfect.