Browse Tutorials
7 Tips to Optimize Your Angular App/Application

7 Tips to Optimize Your Angular App/Application

28 Feb 2024
4 min read
Learn via Video Course & by Doing Hands-on Labs

Angular Course

7 Tips to Optimize Your Angular App/Application: An Overview

Hello there! Have you ever felt like your Angular app might use a boost? Whether you're a beginner or an experienced developer, this Angular tutorial has you covered with seven super-easy techniques to make it run like a dream. These tips, combined with comprehensive Angular certification training, will make your software shine brighter than ever, from faster performance to a smoother user experience. Following are the 7 Tips to Optimize Your App/Application

Tip 1: Controlling Change Detection:

  • To update bindings on a page, Angular uses unidirectional data flow.
  • The method by which Angular changes model values on the view is known as change detection.
  • There are two primary methods:
    1. Default: Change detection is enabled by default for all components, even if the binding hasn't changed. This is inefficient.
    2. OnPush: Only detects changes in components with altered bindings. This is more efficient, but it must be handled with care.
  • Detaching components from the change detector tree:
  • You can detach components that don't need constant updates to improve performance.
  • Use the ChangeDetectorRef to detach and reattach components as needed. Change Detection Strategy

Tip 2: Lazy Loading:

  • Loading large programs with many modules can take a long time.
  • Lazy loading enables you to load modules just as needed.
  • This can be accomplished by configuring the router with the loadChildren option.

Tip 3: AOT compilation mode + compression:

  • Angular can be used in two ways:
    1. Just in Time (JIT): JIT (Just in Time) compiles files in the browser. This can be time-consuming.
    2. Ahead of Time (AOT): Compiles files ahead of time (AOT) before deployment. This is quicker.
  • AOT mode also avoids sending the @angular/compiler package, which reduces the size of the initial bundle.
  • AOT mode improves performance but is incompatible with dynamically loaded components. JIT- Just In Time Mode

Tip 4: Use Pure Pipes:

  • Angular Pipes are used to format data in the user interface.
  • Because pure pipes always provide the same output for the same input, Angular can cache the results.
  • This can enhance performance by eliminating redundant calculations.
  • When possible, use pure pipes to improve caching and efficiency.

Tip 5: Use TrackBy on ngFor:

  • ngFor is used to iterate across collections and generate templates for each item.
  • For large collections, re-rendering the entire list can be expensive.
  • TrackBy lets you define a function that identifies unique objects in a collection.
  • This allows ngFor to re-render items that have changed.

Tip 6: Don't try to use Angular for everything:

  • Native browser functionalities are sometimes more efficient than Angular directives & bindings.
  • For simple tasks like hovering, use native tools like CSS pseudo-classes.
  • This can help to reduce the number of change detection cycles while also improving performance.

Tip 7: Service Worker and Server-side rendering:

  • Service Worker: A background script that can increase performance. Service Workers can be used to cache API replies and HTML pages, lowering load times.
  • Server-side rendering (SSR): Improves First Meaningful Paint (FMP) by rendering the initial page on the server. Although this is useful for SEO & social link previews, it is more difficult to deploy than client-side rendering.

This article provides seven tips for optimizing your Angular app: Control change detection, use lazy loading, select AOT compilation, exploit pure pipes, track ngFor items, examine service workers, and server-side rendering. These changes will improve performance, improve the user experience, and will make your app shine!


Q1. What is one Angular feature that will assist the developer in improving overall application speed by reducing server requests?

Lazy loading is a method of optimization that allows content to be loaded only when it is required. It is done to improve the app's overall performance and speed up its initial load time.

Q2. What is Angular's performance issue?

Heavy processing in the template or improper use of change detection can cause slow rendering time. Unoptimized HTTP Requests, if your Angular app makes too many HTTP requests or transmits huge data payloads, the app's performance will suffer.

Q3. How can I prevent making several API requests in Angular?

We may avoid calling many API services by using RxJS's shareReplay function. shareReplay subscribes to the observable, caches the response, and then multicasts it to all subscribers without repeatedly accessing the API.

Take our free angular skill challenge to evaluate your skill

In less than 5 minutes, with our skill challenge, you can identify your knowledge gaps and strengths in a given skill.


Share Article
About Author
Pankaj Parkar (Google GDE, Speaker and Technical Lead)

He has over 6 years of vast experience in web application development. Currently, he is working as a Technical Lead at Synerzip, Pune. He has worked on different front-end (angular, react, emeberjs, graphql, etc) and back-end (.net, c#, node, firebase, prisma, etc.) technologies. He is extremely passionate about knowledge sharing. He is been into Angular application development for almost the last 6 years. Also, he has been awarded with Microsoft MVP award consecutively thrice. His hobbies include spending time in different open source technologies and contribute to them. Most of the time you will find him helping people on StackOverflow for angular questions.

Accept cookies & close this