Quick Summary:

Angular is the fourth highly used framework for application development. It brings scalability, reliability, and security to your web and mobile application. To keep up with your Angular application performance and endurance, you are required to write a clean code by maintaining the coding standard to enhance the performance of your Angular application. This blog post is a complete guide to Angular performance optimization in 2022 to improve the performance of your existing Angular application.


Angular is a high-performance framework. Still, it requires following some best practices to keep your Angular performance optimization boosted. I have covered some sure-shot tips to speed up the performance of your Angular application. Applying these Angular tuning techniques, you can eliminate the common bottlenecks and speed up your Angular app.

Your users will undoubtedly love it when your app performs smoothly and hassle-free. So let’s explore the Angular performance checklist to identify and understand how to enhance the performance of your angular app.

Angular Performance Optimization: Top Tips and Tricks

Here is the list of sure-shot tricks to optimize your Angular app to improve the runtime of your Angular app.

1. Limit $watchers and Reduce Digest Cycles

As you add data bindings to your app, you create more $watchers and $scopes. By prolonging the app’s digest cycle, causing lag. To reduce the digest cycle, you must use fewer watchers in your app, which will make the digest cycle shorter.

2. Use $watchCollection Instead of $watch

We advise you to use $watchCollection instead of $watch because the watch function with 2 parameters is much faster than the watch with 3 parameters. It looks like this: $watch(‘value’, function(){}, true), where the 3rd parameter takes a long time to execute. It deeply checks every object, which can alter the app speed.

Copy Text
// Use the relatively new watchCollection().
					function( newValue, oldValue ) {

						addLogItem( $scope.watchCollectionLog );


// Use the old watch() with default object equality,
// which defaults to use object REFERENCE checks.
					function( newValue, oldValue ) {

						addLogItem( $scope.watchLog );


3. Performance Issues With Chrome DevTools

For Angular performance optimization in your application, you must know your app’s challenges. Without being aware of the issues, you cannot fix them. So, you need to find the performance bottlenecks of your app using the Chrome DevTools like Timeline and CPU Profiler. This browser-related technique is beneficial.

4. Disable Comments & CSS Class

Many apps have minimalistic features and functionalities; they might not require CSS styling and comments directive. If your app is such that it doesn’t need comments, then you must disable your Comments Directive and CSS class. These two functions can take time to load and affect your app’s performance.

5. Smaller DOM Trees

Your app may slow down by frequent access to the DOM. Hence, you should keep your DOM structure small, and if possible, you should not change your DOM. Also, you must ensure proper bundling and minification in your program scripts. By doing so, your app page load times will reduce. This trick increases your app’s performance. Join hands with India’s Best Angular Development Company to build experiences that drive results.

6. Use Lodash of Native Javascript

Using the Lodash library will significantly enhance your Angular app performance. By using such Angular best practices, you can rewrite the program logic and upgrade the in-build methods of Angular. This way, you can substantially improve your app’s speed.

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<script type="text/javascript">
  angular.module('example', ['angular-lodash']);
  app.controller('MainCtrl', function($scope) {});

<body ng-app="example">
  <div ng-controller="MainCtrl">
    <!-- output unique numbers from input.. [1, 2, 3, 4, 5, 6, 7, 8] -->
    <div ng-repeat="num in [1,1,2,3,4,5,5,6,6,7,7,7,8]|uniq">{{num}}</div>

7. Watch Out For ng-repeat

Your Angular application may slow down as you repeatedly use ng-repeat. Instead of using ng-repeat, you can use its substitutes like $interpolate provider for rendering global navigation.

Copy Text
  bc-string="Item 0 matches ${0}, item 1 matches ${1}, etc..."
  bc-array="['ZERO', 'ONE']"

<!-- Output:
  Item 0 matches ZERO, item 2 matches ONE, etc...

8. Use Protractor and Batarang Performance Tools

The Angular team has developed a fantastic testing tool- Protractor, which flexibly runs tests. By using Protractor, you can improve your app performance tremendously. The team also developed a debugging tool, a chrome extension- Batarang. You can use Batarang to track your performance benchmarks. Apart from these two tools, other tools like NightwatchJS, WebDriverIO, TestingWhiz, etc., are available.

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9. Replace ng-show/ng-hide With ng-if

The show and hide directives keep toggling the CSS styles of a particular element, whereas the if directive removes the elements whenever not needed. Thus, the show directive takes a longer load time. Similarly, you can also use ng-switch as an alternative to ng-if for better performance of your Angular application.

10. Keep a Check on ngDoCheck

The directive ngDoCheck runs every time you change and detects the change. So if you are using this function for any computationally slow affair, your app will be slowed down. Thus, you must keep a high check on what and how you use this function to ensure about Angular performance optimization in 2022.

11. AOT Compilation

Angular, by default, uses Typescript. To run web applications on the browser, you must compile the Typescript code and change it to JavaScript to make it easier for the browser to understand.

Angular provides two types of compilation modes: AOT (Ahead of time) and JIT (Just In Time).

Ahead of time Compilation expect the compilation at development time. It only produces the compiling templates and takes the Angular compiler from the deployment bundle. This process helps in reducing the payload time and enhances the performance of applications.

12. Lazy Loading

Whenever an Angular application compiles, Angular in the backend uses Webpack to generate bundles that ultimately consume memory and reduce the application’s speed. To solve this problem, you can use the Lazy Loading method that splits the bundle into multiple modules and features to improve the Angular application performance.

Final Word

Not all of these Angular performance optimization tips can be implemented altogether in your app to improve its performance. Looking at your app’s requirements, you must implement those tips that benefit your app and business. I am very much sure that after reading the above Angular performance optimization guide 2022 you would have understood that Angular app performance optimization is not that easy it requires skilled and experienced professionals who can help you optimize your application in the best possible way.

If you are already convinced and looking for a helping hand to enhance the performance of Angular app, then connect with us today to hire Angular developer of your choice with the desired skillset.

Frequently Asked Questions (FAQs)

There are numerous ways of Angular performance optimization in your existing application. But the best way to tune your application is Lazy loading. It allows you to split bundles and modules to reduce memory usage.

The best practice to improve the quality of Angular code is to try centralizing state management, avoid logic out of the module, and use the right Async code.

Below are the best possible ways that are worth considering to increase the page speed of your Angular application:

  • Decrease HTTP requests
  • Decrease the number of server requests to improve the performance of your application.
  • Allow Gzip compression to increase page speed.

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