Tuesday, May 28, 2024

Tips to Optimize Angular Application that Increases Website Speed


Over four million websites worldwide run on AngularJS, a framework known for a shorter learning curve, real-time testing capabilities, and enabling optimal web app development.


However, developers and businesses face certain issues during development.

Here are some common issues faced by Angular Applications:

  • Unoptimized server usage
  • App crash due to errors
  • Periodic slowdown due to issues such as overloading
  • Slow website response
  • Newly migrated technology doesn’t support the changes
  • Errors due to incorrect data

How to Improve Angular Performance?

The performance issues in angular apps described above directly affect the end user’s in-app and onsite experience. Reduced web traffic, little or no unique visitors on the business website, or reduced customer engagement, are some of the consequences if the above problems persist.

As every Angular application is unique, it can be challenging to identify the causes of the issues.

In a situation like this, hiring Angular developers is effective in isolating the cause of the issue and fixing them.

Also, we have compiled 10 general tips that will help you improve your website’s speed by optimizing your Angular application.

1. Switch the Change Detection Strategy to “OnPush”

Change detection is a common feature app developers utilize for application development that detects when the user’s data got changed. It does it with updates of the DOM to reflect and highlight the changes.

DOM elements are used to structure, access, and manipulate documents.

The DOM framework elements have the data they use to obtain information from their parent mechanisms. Angular analyzes the component tree and stores the information for any change from its initial parameters when an asynchronous event happens.

Via the strict equivalence operator, evaluating for any change in data is carried out for the app’s best output. The operator also checks for connectivity differences in the branch’s inputs or branching elements. And, therefore, a new memory is allotted for the latest input’s updated parameters.

2. Removing the Change Detector (CD)

When you strategize your website development plans with Angular, you have to follow a tree section with a data change detector while structuring data. This change detector can be infiltrated (ChangeDetectorRef) to:

  1. Remove the CD tree’s component
  2. Connect it to the existing CD tree.

Hence, when Angular runs CD on an element tree, its components with its sub-trees will be skipped which will increase the speed of code execution.

Angular Developers remove the Change Detector by the using ChangeDetectorRef class.

export abstract class ChangeDetectorRef

abstract markForCheck(): void; abstract detach(): void; abstract detectChanges(): void; abstract checkNoChanges(): void; abstract reattach(): void; 


3. Implement Slow Loading

Lazy loading, as one of the important AngularJS application development features, lets devs work around the complication of routers and components. It enables them to fly over the mayhem that Chunk files bring and to segregate huge piece files into several smaller ones.


It comes with JavaScript (JS) components; they are loaded when the relevant router makes the call.

4. Ahead-of-Time (AOT) Compilation

AOT compilation assists in the conversion of TypeScript code into cleaned JS code and optimizes by compressing the entire snippet before compilation and execution. This is one of the defining features of Angular and is one of the default features implemented to improve website loading speeds.

But is it better than the just-in-time compilation? Let’s take a look.

5. .JIT vs .AOT

Angular offers two compilation methods for developers: just-in-time and ahead-of-time. The former compiles your code when it runs, in real-time, whereas the latter compiles the code at build time.

By default, Angular developers rely on the JIT compilation method that requires them to incorporate the compiler for website and app development.

On the contrary, AOT predicts compilation at build time, generates the accumulated templates, and eliminates the Angular compiler from the bundle.

AOT decreases your website and app’s processing load by around 1MB, almost equivalent to the size of the Angular compiler itself.

6. Use Serve Scaled Visuals

Serve Scaled Images is implemented to reduce the loading time of your web app. This process scales pictures used in the website (or app) and hones the website with them.

However, you must keep in mind that large photos may be trodden into a fixed size, which will consume more storage. As a result, the website’s speed will be reduced.

To ensure proper optimization, developers must take care that the uploaded image files are of the actual dimensions of the HTML images on the site. This will improve the load speed greatly.

7. Minimalism is good

Multiple parameters are implemented for better aesthetics and readability such as JS snippets, newline characters, descriptive comments, block delimiters, and spaces for optimization for speed.

Although they are not necessary for the code to compile without errors, it is a pro tip that you should follow for minification.

This minification method helps eliminate these characters which simplifies their identifiers while disregarding complex code for new edits and additions. This process increases the website speed, leading to an improved user experience (UX).

To understand the process fully, take a look at this snippet before minification:

var app = angular.module(“myApp”, []); app.controller(“myCtrl”, function($scope) { $scope.title = “Lorem”; $scope.subtitle = “Ipsum”; if (false) { console.log(‘Lorem Ipsum Dolor’); }});

And compare it with this code after minification:

var app=angular.module(“myApp”,[]);app.controller(“myCtrl”,function(l){l.title=”Lorem”,l.subtitle=”Ipsum”});

8. Turn on Production Mode

Angular works in debug mode that enumerates certain assertion evaluations and deploys  ChangeDetection twice by default. This makes sure that there are zero unexpected modifications to the binding values of the constituting elements.

This costs valuable time which can be saved by changing it to production mode.


To call it Change Detection once, devs need to enable Production Mode by attesting the code below:

import { enableProdMode } from ‘@angular/core’;import { environment } from ‘./environments/environment’;if (environment.production) { enableProdMode();}

9. Optimize Images for Size and Quality

While creating and executing an Angular app (for website), perfecting pictures is an important method to increase website speed. With the site, image optimization assists improve the website performance.

Angular web development recommends keeping the file size in (KB). Devs consider these while uploading images because it is crucial to change huge images into smaller ones before they are uploaded.

10. Code Splitting

It is yet another method of reducing the site load time, and it also plays a role in boosting page navigation. This is necessary because applications become complicated as they grow.

Due to the increasing size of JS files, the browser interaction time, also known as the response time, increases, especially for mobile users. To curb this, the large files are clipped via code splitting to make the tasks simpler.

In other words, code splitting efficiently decreases the time taken by JS code to load in your browser.

Keep in mind that there is no loss or aberration of app features.

This method assists devs in segmenting the JavaScript code by splitting the existing long code into various smaller components which are sequentially executed as the user directs to different elements of the app.

Wrapping up

AngularJS is one of the most widely adopted frameworks for web application development of its versatility and ease of implementation. However, if careful measures are not undertaken during the course of the development of an app with the AngularJS framework, it could slow down your site.

With the ten tips we provided above in this post, you can easily guide your development team to fix and repair the code with will improve the performance of the AngularJS website.

Noman Sarwar
Noman Sarwarhttp://www.webtechspark.com
Noman Sarwar is a professional content writer and creates SEO optimized articles and blog posts for brands that want to see their Google search rankings surge. He also provides ghostwriting, proofreading, and content editing services to help you embellish your pages with copies that convert.



Related Stories