Angular can feel magical but it is not a magic bullet. That magic comes with a cost, and that cost sometimes means slow/laggy apps. Once you’ve …
Source: Angular Performance Diagnosis 101 – The Code Dump
Source: Using ECMAScript 6 (ES6) with AngularJS 1.x » Tim Roes
How well does track by improve ng-repeat loop speed? What is the impact of one-time bindings on performance. The results were surprising.
Source: AngularJS Performance Testing track by & one-time bindings