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9 Ways to Improve AngularJS Performance

AngularJS is the most widely used web app framework nowadays and its popularity graph is constantly rising after the arrival of its much-awaited version AngularJS 4.0. But we can see, almost every Angular expert still struggle with various issues that directly claims to AngularJS performance even though it has a lot of its own optimizations.

Today, Online Businesses are greatly affected by the performance of web technologies which they use for their respective projects. Hence, It becomes necessary to dig out all such factors which are ceasing their business growth.

But there might be cases present where the incorrect use of AngularJS methods restricts your application stand in the market. So, AngularJS performance optimization becomes an important need of every AngularJS development expert. That’s why we have listed 9 ways to Improve AngularJS Performance in this blog.

Read More: Top 7 Reasons To Choose AngularJs

Recently, a survey was conducted by Brazilian computer scientists who found interesting facts what causing performance problems to AngularJS programmers. However, There is not much information about How AngularJS performs in the real world. But researches based on surveys provide some pieces of evidence for it.

The survey comes up with the following results:


45% voting to source code problem that affects performance.

Only 8% admit to actually making changes.

Some respondent were blaming architecture of AngularJS.

Some of them claimed its unnecessary two-way binding.

After so much discussion on AngularJS performance, now it’s time to take you to those 9 ways through which you can improve AngularJS performance.

Here is the list:

AngularJS performance can be easily measured by its “digest cycle”. Digest cycle can be taken as a loop. During this cycle, Angular checks if there is any change to all the variables watched by all the $scopes. if  $scope.myVar is defined in a controller and marked for watching then Angular will monitor the changes on myVar in each loop iteration.

1) Batarang tool to benchmark watchers:

Batarang is a great Dev-tool from the Angular team which lowers your debugging efforts. Although it has many new features, some of them help you profile and track the performance of your AngularJS performance. Moreover, Watch tree determines which scopes are not destroyed as it seems to be if there is any increase in the memory.

2) Use of native JavaScript or Lodash:

Lodash boosts your application performance by simply re-writing some of the basic logic instead of relying on inbuilt AngularJS methods. If Lodash is not included in your application then you would probably need to re-write everything in native JavaScript.

3) Chrome Dev-tool profiler to identify performance bottlenecks:

This one is a handy tool which gives you the option to select which profile type you want to create. Record Allocation Timeline, Take Heap Snapshot, Record Allocation Profile are used for memory profiling. After this performance optimization, you app will fully render in less than 2 seconds and users can freely interact then.


4) Minimize Watchers:

AngularJS completely revolves around its digest cycle. Whenever a digest cycle is triggered, it loops over every binding to detect model changes. The amount of time taken in each digest cycle can be reduced by reducing the number of watchers. It also reduces application’s memory footprints.

5) ng-if is better than ng-show:

ng-show directive toggle the CSS display property on a particular element while ng-if directive actually removes the element from DOM and re-create it if needed. Further, ng-switch directive is an alternative to ng-if for same performance benefits.

6) Not to use ng-repeat:

This is the biggest win for any app if it is not using ng-repeat directive. So it is advisable to avoid ng-repeat and build the HTML using JavaScript. For vocalize application, the use of ng-repeat results in addition of unnecessary watchers. Use of ng-bind-html directive is a better solution to get rid of this problem.

7) Use $watchCollection(includes 3rd parameter):

Using $watch with two parameters is good but using $watch with three parameters e.g. $watch(‘value’,function(){},true) makes Angular to perform deep checking(to check every property of the object). But this could be expensive. Hence, to resolve such performance issue, angular provides $watchCollection(‘value’, function(){}) which acts almost alike $watch with 3rd parameter except it only checks first layer of object’s properties at low cost.

8) Use console.time for debugging issues:

If your application is struggling with debugging issues and effecting Angular performance, then use console.time which is a great API.

9) Debounce ng-model:

You can debounce the input with ng-model. For example, to de-bounce the search input like GOOGLE, you have to use ng-model-options=”{debounce:250}”. This makes digest cycle to get triggered no more than once per 250ms due to the changes in this input model.

Since development time is at a premium nowadays. So, you need a comprehensive framework such as AngularJS to run your business quickly out of the box.

After researching a lot, We have collected some other important tools to enhance AngularJS performance.

Check out the list of 4 AngularJS performance enhancing tools:

Protractor:  It is the most powerful automated end to end Angular testing tool which was developed by the Angular team. Protractor is built by combining some great technologies available today like NodeJS, Selenium, webDriver, Mocha, Cucumber, and Jasmine.



gulpjs: It is used  for automating repetitive tasks, the streaming build system, linting Java Script using jshint or eslint.



TestingWhiz: It is one of the most user friendly test automation tools because of its code-less scripting feature. TestingWhiz offers end-to-end testing solution to test AngularJS applications. It has variety of test commands to easily create tests related to AngularJS. With a more dynamic wait command TestingWhiz synchronizes with the varying server wait times for AngularJS components.



WebdriverIO: WebdriverIO lets you control a browser or a mobile application with just a few lines of code. Your test code will look simple, concise and easy to read. The integrated test runner let you write asynchronous commands in a synchronous way so that you don’t need to care about how to handle a Promise to avoid racing conditions. Additionally, it takes away all the cumbersome setup work and manages the Selenium session for you.


Concluding Note:

As now we have seen, the web development scenario is changing at a fast rate due to the introduction of many new and updated JavaScript frameworks for web development. To get maximum benefit from these frameworks, you must keep optimizing of its performance on regular basis.

AngularJS is a powerful framework to build web applications like no other. By improving AngularJS performance, developers become able to do more with less coding of it. Even the risk of producing “spaghetti code” is greatly reduced.

MarkupBox is a leading front-end developing company in India. With our JS development professionals, you get various business benefits. If you want to outsource AngularJs development services for your project, then you can contact us .



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