Angular Zone

https://www.youtube.com/watch?v=3IqtmUscE_U
https://blog.thoughtram.io/angular/2017/02/21/using-zones-in-angular-for-better-performance.html
https://blog.thoughtram.io/angular/2016/02/01/zones-in-angular-2.html
https://blog.kwintenp.com/how-the-hell-do-zones-really-work/