Web Development

Best Practices for Angular Performance Optimization

You ask for a service, and there is an app for it!

Yes, today we are surrounded by apps in much denser form. The last decade has witnessed an immense evolution of smartphones and the apps supporting them.

With the onset and decline of COVID period, apps have become an inevitable part of our lives, boosting the rate to Hire angular application developers.

Indeed, apps have revolutionized the way we communicate, learn, and entertain ourselves, ,and have turned into our personal assistants fitting into our pockets.

However, with the increasing number of apps available, users cannot afford to waste time waiting for slow apps to load, especially when they need information quickly. The need for speed and efficiency has become an essential aspect of app development in today’s world.

In simpler words, users are more impatient than ever before and need apps to display information at a turbocharged speed. This calls for technology to play its role and ensure that the user experience is not just smooth but fast beyond expectations.

When we look at the technological world around us, we can see how various app development technologies have grabbed our attention. 

One of the most noteworthy technologies in recent years has been Angular!

Angular is an open-source web application framework that has gained popularity among developers due to its versatility, scalability, ease of use, and measures of Angular Performance Optimization

It has become the framework of choice for developers who are seeking to build robust, adaptable, and maintainable web applications.

Angular apps- lacking performance?

Well, as we know, Angular is a popular JavaScript framework that has been used to develop a wide variety of web applications. 

However, as the size and complexity of these applications grow, it is important to ensure that they remain performant. 

Despite the fact that Angular itself is a performant framework, it is still possible for Angular applications to become slow and unresponsive if they are not developed with performance in mind. 

Fret not!

In this blog, we will explore some strategies for  Angular Performance Optimization ensuring your apps remain responsive, even as the size and complexity of your codebase grows.

So what are you waiting for?

Let’s get started!

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Change detection strategies

In Angular applications, ensuring that your templates render efficiently is key to improving overall performance. 

One area that can have a particularly significant impact on performance is change detection. 

When a change is made in the data model, Angular has to check every binded value for updates, which can be time-consuming for large-scale applications. 

Therefore, it is crucial to have a solid understanding of how to optimize template rendering in order to reduce the overhead caused by change detection.

The way to improve it can be done with OnPush change detection!

It offers an efficient way to do this by detecting and responding only to state changes that affect the view or its data bindings. 

Rather than constantly checking for changes, OnPush change detection only updates the view when new input data arrives through @Input.

Further, when state changes are triggered by the component or one of its directives, it can lead to significant performance improvements, especially when dealing with complex and data-heavy views.


Design for immutability is a coding concept that is becoming more and more popular in the tech industry. 

It means that a program’s state changes must happen immutably, which guarantees that the program’s state is never modified after it is created. 

By offering a new reference provided to a component’s input to trigger change detection with onPush, the program ensures that all state changes are immutable within Angular Performance Optimization strategy. 

This design pattern has many benefits, including making the code easier to test, reason about, and debug.

Utilize pipes in templates

In Angular, pipes are a way to transform data dynamically. 

They can be used in interpolation and binding expressions to format or manipulate the displayed data. 

A pure pipe is a type of pipe that only depends on its input arguments and does not have any internal state or side effects. 

This means that a pure pipe can be executed only when its input changes, which can improve performance by reducing unnecessary recalculation.

Using trackBy in ngFor

In web development, dynamic data is the norm, and Angular’s ngFor directive is a convenient way to loop through arrays and display data. 

However, when the array changes, Angular’s default behavior is to remove the whole list from the DOM and recreate it again, which can be a performance issue. 

To solve this, there are a few approaches, including using Angular’s built-in trackBy function, which can be embraced within Angular development services.

It can also be resolved by creating a custom trackBy function to tell Angular how to identify individual items in the list. 

Angular’s ngFor directive provides an easy way to loop over collections and display data in the view, but sometimes we run into performance issues with large datasets or frequent updates. 

That’s where the trackBy function comes in. 

By evaluating which item has been updated or removed from the list, it only renders that specific item instead of the entire list, resulting in a significant improvement in performance. 

This feature can be especially useful in high-traffic applications where users interact with dynamic data.

Cache values from pipes and functions

Pipes are an important concept in Angular development, allowing for a convenient way to transform data for display purposes. 

Leveraging pure pipes, developers can ensure that the transformed values are immutable and the transformation is only applied when needed. 

However, even with pure pipes, there is the potential for inefficiency when dealing with large datasets or frequently updating values. 

This is where caching previous values can be useful, avoiding the need for recomputation and improving the performance of our application.

Detach change detection

When it comes to optimizing performance for heavy computation, it’s essential that developers only trigger change detection manually for Angular Performance Optimization.

For specific components, this can be conducted, rather than relying on automatic change detection. 

It allows developers to avoid unnecessarily triggering change detection for all components in the application, which can lead to slower performance and render times. 

Also, manual change detection can reduce the number of unnecessary re-renders, which can ultimately improve the overall user experience.

Cache static content using Angular PWA

A ubiquitous fact, loading time is a crucial factor in the user experience of any web application. 

This is especially true for Angular apps, which can take longer to load due to the size of the JavaScript files.

One way to mitigate this issue is to cache the static content, which can significantly reduce the load time of your Angular app. 

By using Javascript and CSS bundles, images and static files can be cached in the browser, allowing them to be presented without the need for a server call. 

This improves page load times and the overall user experience, making it an essential technique for any web developer. 

Cache HTTP calls using Angular PWA

Angular PWA, short for Progressive Web Apps, is a high-performance web application framework.

Page load time is an important aspect of the user experience these days, as it significantly affects the bounce rate and overall user experience of Angular Performance Optimization. 

To tackle this issue, caching is used in combination with Angular Progressive Web Apps, lazy loading, and bundling. 

It lets developers create fast, reliable, and engaging web apps for desktop and mobile devices. 

It has the ability to easily set up caching rules for HTTP calls, which dramatically improves the overall user experience by reducing page load times. 

Using this, developers can simplify their codebase, improve app performance, and provide users with a smoother browsing experience. 

Angular PWA also provides tools for offline data access and synchronization, making it an ideal choice for building robust, reliable web apps.

Lazy load routes

It is an optimization technique that can significantly improve the performance of an application. 

When you hire angular developers, you must ensure that rather than loading all the routes at once, which can be slow and resource-intensive, only the necessary routes are loaded when needed. 

This means that a feature or component will be bundled in its own bundle and can be loaded on demand. 

It enables applications to avoid loading large parts of the code that aren’t required, which can lead to faster load times and a better user experience.

Optimize bundling and preloading

It eliminates the delay that may occur between requesting the feature module and rendering it, resulting in a faster user experience. 

By delaying the rendering of non-critical content, developers can reduce the initial load time of the pages. This can especially benefit users who are browsing on slow networks or devices with limited resources. 

Preloading feature modules can provide an additional performance boost, making it a top choice for many developers seeking faster load times.

Server-side rendering with Angular Universal

To build an Angular app that needs to deliver indexed pages to users, one thing that should be considered is server-side rendering. 

It speeds up page load times for users and provides a better overall user experience. 

With server-side rendering, the app is rendered on the server before being sent to the client, enabling the user to receive a complete HTML document that can be loaded more quickly.

In order to implement server-side rendering for Angular apps, developers must ensure that their server is set up to handle the rendering process.

Reduce additional checks with ProdMode

As we all know, enabling production mode is an essential step in optimizing the performance of an Angular application. 

It turns off the assertions, which are additional checks made by Angular, that can slow down the application in development mode.

It ensures that fewer resources are consumed by the application, thereby increasing its speed and efficiency.

Code Splitting 

It is basically a tool that can be used to break down large and complex Javascript bundles into smaller, more manageable chunks. 

This process results in reducing the amount of redundant code that is loaded, thus making the application faster and more efficient. 

It is a blessing for applications with a large and complex codebase or those with multiple entry points. 

Using this method, developers can only load the code necessary for a particular part of the application, rather than the entire application, which can further improve performance.

Keep a check on Memory Leak

Memory leaks can be a common problem in many software applications, especially those that are more complex. 

When resources are not properly eliminated and freed up for other processes, the system can become bogged down and less responsive. 

Hence, by staying vigilant about addressing memory leaks developers can ensure the ongoing health and performance of the application, and prevent unnecessary crashes and downtime.

Using Tree-Shaking to remove unused code 

Tree-shaking is a popular optimization technique used in modern JavaScript frameworks to get a smaller and optimized bundle size. 

When writing code, it helps developers to ensure that only the necessary JavaScript modules are included in the final bundle. 

It involves identifying and removing the portions of the code that are not referenced or used, making the code cleaner and more efficient.

Server-Side Rendering Using Angular Universal

Angular Universal is a powerful tool that enables the server to render applications to HTML instead of the browser.

It improves the Angular Performance Optimization, boosts SEO friendliness, and enables pre-rendering of pages for fast loading. 

Furthermore, it ensures to offer similar UI and UX on both client and server helping to reduce rendering conflicts.

Use AoT Compilation

Angular introduced the Ahead of Time (AoT) compilation with the release of version 8. 

It enhances application performance by detecting and eliminating errors early in the development process. 

AoT compilation also reduces application startup time and offers better security by preventing client-side attacks. 

Concluding Thoughts

In this modern era of web development, Angular has emerged as the go-to framework for front-end development. 

It offers an effective way of building complex single-page applications. However, as applications grow in complexity and scale, performance optimization becomes a crucial aspect. 

Henceforth, to build a high-performance Angular app, it is essential to identify and address any potential bottlenecks that may be present with a Professional angular development company

Thankfully, there are a number of effective methods for doing so, many of which have been explored in depth in this blog post.

You must carefully analyze the application and make smart decisions about where to focus the app’s optimization efforts.

With this hope, that you would enhance the app’s overall speed and responsiveness, delivering a more seamless and enjoyable user experience, we bid you goodbye.

Until our next post Happy Reading & Coding!

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