Simple ng-repeat rendering timer

ngRepeatTimer.js

angular.module('someModule', [])
  .directive('ngRepeatTimer', function() {
    var start;
    return function(scope) {
      if (scope.$first) {
        start = new Date().getTime();
      }
      if (scope.$last){
         console.log('ng-repeat rendering time:', new Date().getTime() - start);
       }
    };
  });
  
// <li ng-repeat="thing in things" ng-repeat-timer>