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home / developersection / interviews / what are some ways to improve the performance of an angularjs application?
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Ravi Vishwakarma
Ravi Vishwakarma

IT-Hardware & Networking

Ravi Vishwakarma is a dedicated Software Developer with a passion for crafting efficient and innovative solutions. With a keen eye for detail and years of experience, he excels in developing robust software systems that meet client needs. His expertise spans across multiple programming languages and technologies, making him a valuable asset in any software development project.

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Ravi Vishwakarma
Ravi Vishwakarma 30 Mar 2025
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Improving the performance of an AngularJS application involves optimizing various aspects such as data binding, digest cycle efficiency, lazy loading, and reducing unnecessary computations. Here are some key strategies:

1. Optimize Digest Cycle

  1. Use ng-if instead of ng-show/ng-hide
    1. ng-if removes the element from the DOM, while ng-show just hides it, reducing the number of watchers.
  2. Minimize ng-repeat usage
    1. Use one-time binding (::) for static data.
    2. Use track by to improve performance:
      <div ng-repeat="item in items track by item.id">
  3. Consider pagination or infinite scrolling to reduce large lists.

2. Reduce Watchers & Bindings

  1. Use one-time binding (::) for data that doesn’t change:
  2. Remove unnecessary $watch expressions.
    <h1>{{ ::title }}</h1>
  3. Use debouncing or throttling for events like keyup or scroll using lodash or $timeout.

3. Lazy Loading & Minification

  1. Lazy load Angular modules using ocLazyLoad or ui-router’s resolve.
  2. Minify and concatenate JavaScript and CSS files to reduce HTTP requests.

4. Optimize Filters & Expressions

  1. Avoid using filters inside ng-repeat as they create a new function call in each digest cycle:
    <div ng-repeat="user in users | filter:searchText">
    Instead, use pre-filtering in the controller:
    $scope.filteredUsers = $filter('filter')($scope.users, $scope.searchText);
  2. Use limitTo instead of filter inside ng-repeat where possible.

5. Optimize API Calls

  1. Use $cacheFactory or localStorage to store API responses.
  2. Debounce API calls when typing in a search input.
  3. Use resolve in ui-router to fetch data before rendering a view.

6. Use bindOnce for Directives

  1. In custom directives, avoid scope: {} for static data.
  2. Use bindToController: true for better performance.

7. Avoid Deep Watches

  1. $scope.$watch with deep watching (true as the third argument) slows down performance. Avoid it if possible:
$scope.$watch('largeObject', function(newVal, oldVal) {
    // Avoid deep watch if not necessary
}, true);

8. Optimize DOM Manipulations

Use directives instead of controllers to manipulate the DOM.

Use $timeout or $applyAsync to batch updates and reduce digest cycles.

9. Reduce Dependencies

Remove unnecessary third-party libraries.

Use AngularJS' built-in services instead of external ones if possible.

10. Enable Production Mode

Use ng-strict-di to catch dependency injection issues in production.

Minify and use AngularJS in production mode (angular.min.js).

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