ng-idle-apply-timing.js

// Measures how long a idle apply cycle takes
// More watchers - longer cycle
// More complicated expression logic - longer cycle
// Also creates CPU profile for debugging bottlenecks (Chrome DevTools)

// assumes the angular application is at least around the document's body

/* global performance */
(function profileIdleTiming(angular) {

  function timeApply($rootScope) {
    console.profile('$apply');
    var started = performance.now();
    $rootScope.$apply();
    var takes = performance.now() - started;
    console.log('idle $apply takes', takes, 'ms');
    console.profileEnd();
    return takes;
  }
  timeApply.$inject = ['$rootScope'];

  angular.element(document.body).injector().invoke(timeApply);
}(window.angular));