How To Improve Angular Application Performance

Angular is a powerful JavaScript framework that works well for building complex, dynamic web applications. If Angular applications are not optimised appropriately, they might become slow and unresponsive.

In this post, we’ll cover a number of tips and techniques for improving the effectiveness of your Angular applications. These recommendations encompass not just the well-known methods but also some new ones unrelated to signals.

1. In ngFor loops, use trackBy

Use the ngFor directive to loop over a set of data and render a template for each item. Nevertheless, if the collection is large, performance problems can occur.

To improve efficiency, you can use the trackBy attribute to keep track of changes made to the collection.

2. Make Use of Lazy Loading

You can load only the components that are truly required at that specific instant by employing the slow loading technique. This can help improve performance by reducing the amount of the first bundle that the browser downloads.

To use lazy loading, each component that loads slowly must have its own module. You can use the router to load the module when the component is needed.

3. Steer Clear of Using ngIf On Intricate Expressions

Use the ngIf directive to conditionally render a template. However, if the expression used to control the visibility of the template is complex, there may be performance problems.

If you want performance to improve, avoid using ngIf with complex expressions. They should be replaced with the ngSwitch or ngTemplate directives.

Also, Read Featuring ngxTranslate To Implement Translation In Angular

4. Apply The OnPush Change Detection Technique

Angular uses change detection to monitor changes to the application state. On the other hand, overuse of change detection could lead to problems with performance.

To improve performance, you might use the OnPush change detection technique. This method merely searches for alterations in reaction to explicit modifications made to the application state.

5. Employ Unchangeable Data Structures

Angular uses immutable data structures by default. This suggests that each time a data structure is altered, a new duplicate of it is created. This can help to improve efficiency by relieving Angular of the burden of tracking changes to the data structure.

6. Utilise The AOT Collection

Angular is able to precompile the application code by using an AOT compilation approach. This can help improve performance by reducing the amount of work the browser has to do while the application loads.

To use AOT compilation, you have to enable it in the Angular CLI. This can be done by running the following command:

ng build –aot

7. When Rendering Server-side Content, Use Angular Universal

Rendering Angular applications on the server is made feasible via the Angular Universal technique. As a result, users with slow connections might experience an improvement in performance.

Using Angular Universal requires installing the Angular Universal package and activating it via the Angular CLI. This can be done by running the following command:

ng add @angular/universal

Also, Read How To Encrypt an Existing Unencrypted EBS Volume For EC2 Instance

8. Combine Signals With RxJS To Create Reactive Programming

An API for JavaScript reactive programming is provided by a package named RxJS. Reactive programming can facilitate Angular programmes by simplifying the processing of asynchronous events.

Signals is a new feature in Angular 16 that can be used to improve performance. Signals are reactive values that exhibit changes. This suggests that you can use signals to notify other programme components when a value changes. Through reducing unnecessary change detection cycles, this can help improve performance.

For example, you can utilise a signal in your application to be notified when a user presses a button. This would eliminate the need for Angular to render the entire template each time the button is touched.

9. Employ Web Workers

Web Workers are a feature of modern browsers that allow you to run programmes in the background. This can make CPU-intensive tasks execute in the background, improving the efficiency of Angular applications.

10. Make Use of Instruments For Performance Profiling

Using performance profiling tools, you may identify the areas of your application that are causing performance problems. These tools can show you how much time is being spent on different parts of your application and how often it has to be rendered again.

11. To Serve Your Angular Application, Use a CDN

Using a CDN to serve your Angular application can help to enhance its performance by reducing the distance that the application code needs to travel to reach the user’s browser.