How to Improve Angular App Performance? Key Optimization Tips

If you are in the process of developing an Angular app and looking to improve its performance then check out these essential tips.
Sr. Technical Writer
Harman Arora
23/01/2024
3 Minutes minute read
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How-to-Improve-Angular-App-Performance

In the fast-paced world of web development, ensuring optimal performance is crucial for delivering a seamless user experience.  

Angular, with its powerful features and robust framework, is a popular choice for building dynamic Single-Page-Applications (SPA). However, as applications grow in complexity, developers must focus on optimizing Angular performance to maintain speed and responsiveness.  

In this guide, we’ll explore various strategies and best practices to enhance the performance of your Angular applications. 

1. Lazy Loading Modules

One of the key strategies to optimize Angular performance is leveraging lazy loading for modules. By loading modules on-demand, you reduce the initial load time of your application. Explain how to implement lazy loading and provide examples of scenarios where it can have a significant impact on performance.      

Lazy Loading Modules

Learn more about lazy-loading feature modules  

2. Ahead-of-Time (AOT) Compilation 

AOT compilation is another powerful technique to boost Angular application performance. Unlike Just-in-Time (JIT) compilation, AOT compilation occurs before the application is executed in the browser, leading to smaller bundle sizes and faster rendering. Guide developers on incorporating AOT compilation into their build process. 

Create angular component

create-angular-component

Create angular module

create-angular-module

Build angular using AOT compiler using angular CLI

Build-angular-using-AOT-compiler

Include the generated JavaScript file in your HTML

Include-the-generated-JavaScript-file-in-your-HTML

Explore more about AOT compilation  

3. Optimizing Change Detection

Angular’s change detection mechanism is powerful but can impact performance if not used judiciously. Discuss strategies to optimize change detection, such as using OnPush change detection strategy, Immutable.js, and avoiding unnecessary DOM manipulations. 

OnPush Change Detection Strategy 

OnPush-Change-Detection-Strategy

Immutable Data

Immutable-Data

Async Pipe for Observables

Async-Pipe-for-Observables

ChangeDetectionRef.detach()

ChangeDetectionRef.detach()

Read more on Angular change detection and runtime optimization 

4. Tree Shaking and Bundle Optimization

Explore the concept of tree shaking to eliminate unused code and dependencies from your bundles. Guide developers on configuring their build tools (like Webpack) to perform effective tree shaking and bundle optimization, resulting in smaller file sizes and faster load times. 

Use Production Configuration & Minimize Angular Bundles  

Use Production Configuration

Use Lazy Loading

Use-Lazy-Loading

Remove Unused Code

Remove-Unused-Code

After installing you can run your build 

run-your-build

Read more about Angular Tree Shaking 

5. Caching and State Management

Efficient caching and state management contribute significantly to performance improvements. Discuss the benefits of caching data, optimizing API calls, and utilizing state management libraries like NgRx for better control over application state. Provide real-world examples to illustrate these concepts. 

Example 

Caching-and-State-Management

State Management Service  

State-Management-Service

Component using caching & state management 

Component-using-caching-state-management

6. Optimizing CSS and Styling

CSS can impact rendering performance, and optimizing styles is often overlooked. Share tips on minimizing CSS file sizes, avoiding overly complex styles, and utilizing Angular’s ViewEncapsulation to encapsulate component styles. Discuss the importance of critical CSS for initial page load. 

Scope styling

Scope-styling

CSS minify

Css-minify

Critical path CSS 

Critical-path-css

CSS preprocessor 

Css-preprocessor

Optimize media query 

Optimize-media-query

CSS purging 

Css-purging

Avoid important 

Avoid-important

Also Read: Angular Vs React Web Development  

7. Service Workers for Offline Capabilities

Introduce the concept of service workers and explain how they can be employed to enable offline capabilities in Angular applications. Discuss the implementation of service workers for caching assets and handling requests when the user is offline. 

Install angular service worker

Install-angular-service-worker

Update app module 

Update-app-module

Create server worker configuration 

Create-server-worker-configuration

Testing development 

Testing-development

Build and deploy 

Build-and-deploy

8. Code Splitting

Delve into the benefits of code splitting to break down large bundles into smaller, more manageable pieces. Explain how to implement code splitting in Angular, allowing users to download only the necessary code for the features they are currently using. 

Create feature module 

Create-feature-module

Lazy load feature module 

Lazy-load-feature-module

Use router link 

Use-router-link

Build & serve 

Build-serve-1
build-serve-2

Conclusion:

Boost your Angular app’s performance with these optimization strategies. Keep an eye on your app’s speed, analyze it regularly, and make improvements where needed. Stay updated on the latest best practices to ensure your Angular apps provide a speedy and responsive user experience. Happy optimizing!

About Author:

This blog is written bySatya Narayan Mishra, a Full Stack Developer at BigOhTech. He specializes in MEAN stack technologies to craft innovative products.

Table of Contents

  • 1. Lazy Loading Modules
  • 2. Ahead-of-Time (AOT) Compilation 
  • 3. Optimizing Change Detection
  • 4. Tree Shaking and Bundle Optimization
  • 5. Caching and State Management
  • 6. Optimizing CSS and Styling
  • 7. Service Workers for Offline Capabilities
  • 8. Code Splitting
  • Conclusion:
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