Last Updated on February 17, 2025
Last Updated on February 17, 2025
Quick Summary:
Angular is the fourth highly used framework for application development. It brings scalability, reliability, and security to your web and mobile application. To keep up with your Angular application performance and endurance, you are required to write a clean code by maintaining the coding standard to enhance the performance of your Angular application. This blog post is a complete guide to Angular performance optimization in 2025 to improve the performance of your existing Angular application.
Every user expects their application to load faster and run smoothly, providing a seamless experience. However, it is likely when the application is optimized. And for that, Angular is the best choice as it is a high-performance front-end framework.
It offers numerous tools and techniques that enhance application performance. So, let’s understand how to improve the performance of the Angular application. This blog has covered Angular tips and tricks and the best tools for Angular Performance Optimization that help you speed up your Angular application’s performance.
Following the best practices and Angular optimization techniques, you can eliminate the typical bottlenecks and upgrade your application performance.
Angular offers two types of Compilers: Just in time and Ahead of time. Till Angular 8, Angular default compilation mode was Just in Time (JIT). However, since the release of Angular 9, the default compilation has been Ahead of Time(AOT).
It involves compilation during development time and eliminates the need for a deployment bundle. Also, it helps reduce the application’s size, provide time to render individual components and increase application performance.
Additionally, during the application, their template binding errors are identified and fail fast, so the development process becomes faster.
To use AOT, developers can use the Angular CLI command.
Ng build –Aot
In Angular, Tree Shaking is used to decrease the size of JavaScript’s bundle. Tree shaking removes unused code from the application and shifts it into a smaller, more efficient bundle.
The underlying build system performs it like Angular CLI during the building process. In addition, the build system analyzes the code and detects unused code, functions, or classes not called by the application.
Thus, by removing unused code, the small size of JavaScript helps to load faster and enhance overall performance. However, if you are using Angular CLI, you can make it default.
To enable tree shaking in an Angular application, you can use the following command in the Angular CLI:
ng build --prod --optimization=true --build-optimizer=true
Lazy loading is a default feature of Angular to boost performance. It is an Angular technique with numerous feature modules and helps improve the initial load time. Only essential modules are loaded with lazy loading when a user navigates to a particular application section.
It helps load only some applications simultaneously and decreases the load time. Also, the modules are created routes and split apps into smaller chunks, with each chunk containing a specific feature or section.
By implementing lazy loading in the Angular application, you can make the app more responsive and engaging faster. Also, it reduces the amount of data required to be transmitted over the network and server load.
Lazy loading of modules carried out by using loadChildren property.
Change detection can detect when the user’s data has changed or updated. It is one of the primary features of Angular frameworks, and it is essential for maintaining the consistency of an Angular application.
Change detection refers to applying changes to the application’s data model so that the view can be modified accordingly. Change detection has three strategies to overcome: OnPush detection strategy, immutable data structure, and pure pips.
OnPush is a change detection strategy in Angular and is known as the “checkAlways” strategy. Angular uses the default change detection strategy to check the component’s data model change after every event, such as time, HTTP request, and user inputs.
One of the benefits of a change detection strategy is that it decreases the number of change detection cycles, boosting performance and reducing memory usage. In addition, this strategy instructs Angular only to check changes when the input properties of a component change.
It helps to learn about the application and ensure they use the best practices like lazy loading for optimal performance. The change strategy can identify the user’s data and then update the DOM to demand the changes.
To use a change detection strategy, you can use the following OnPush property:
ChangeDetectionStrategy.OnPush
An immutable data structure is valuable for optimizing change detection in Angular applications. It refers to the data that cannot be changed after creation. By using immutability data, developers can ensure that the application’s data model is updated when necessary and helps to improve overall performance.
Pips are divided into categories: Impure and Pure Pipes. Use Pure Pipes transforms data before it is displayed to the users. Not all pipes are created equally regarding the change detection performance. By using pure pipes, you can decrease the number of unnecessary change cycles.
The impure Pipe produces numerous outputs for the same input over time. To define pure pipes, you can use the following:
@Pipe({
name: 'myPurePipe',
pure: true
})
To define impure pipes, you can use the following properties:
@Pipe({
name: 'myImpurePipe'
})
Avoiding expensive operations is crucial as it impacts the application’s performance. Also, to avoid operations in templates, you should keep templates as simple as possible to improve performance.
Also, it means that you are avoiding complex logic and computations in templates and moving them to component services. Developers can use this technique to optimize the performance of templates.
Additionally, catching expensive operations can help decrease the same recomputing results numerous times and make it more efficient.
A ngZone service is a powerful tool of Angular for managing the change detection process. However, too much use of ngZone affects your application’s performance. Thus, it is crucial to use it accordingly to restrict unintended consequences.
Using ngZone outside the Angular zone would be beneficial to improve its performance. It is possible by using zone-agnostic API provided by third-party libraries like RxJS. Also, it helps developers to avoid change detection cycles and clean up unnecessary tasks.
Also, this function helps to correct change detection automatically and at the right time. It does not let third-party APIs harm the application’s performance.
Each HTTP request made by Angular includes TCP connection establishment, DNS resolution, and TLS negotiation. This will improve Angular performance significantly. Also, one of the best practices to minimize HTTP requests is to use caching.
By caching responses from earlier requests, you can avoid redundant requests and reduce the number of HTTP requests. In addition, combining multiple HTTP requests into a single request can enhance performance optimization in Angular.
Obseverals are a critical factor in Angular’s reactive programming model. It is vital to unsubscribe from Observables and ensure data flow management and app performance optimization. You can use RxJS operators like debounceTime, distinctUntilChanged, and switchMap to optimize performance by preventing redundant API calls.
Additionally, avoid nested subscriptions and use operators like mergeMap or concatMap to ensure cleaner and more efficient code execution. Another important aspect is using shareReplay() to cache responses and prevent multiple unnecessary API requests.
Server-Side Rendering (SSR) with Angular Universal significantly enhances an application’s performance, SEO, and user experience. By rendering pages on the server before sending them to the client, SSR reduces the time for the first meaningful paint, which allows users to see content faster.
It also benefits SEO by ensuring search engines can crawl fully rendered pages instead of waiting for JavaScript execution. Additionally, SSR is beneficial for low-powered devices as it offloads computational tasks to the server, providing a smoother experience.
Angular Hydration is a primary optimization technique that allows seamless transition from Server-Side Rendering (SSR) to Client-Side Rendering (CSR) without unnecessary reloading. Instead of re-rendering components, which was already generated on the server, hydration ensures that the existing DOM is reused, decreasing computational overhead and improving page load times.
This technique prevents UI flitting issues, resulting in a smoother user experience. Additionally, proper event binding in Angular hydration ensures that interactive elements work instantly without delays caused by reinitialization.
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Knowing strategies is enough for enhancement. Still, the cherry on the top would be implementing the following tips to improve your Angular application performance:
The size of images and other assets can be significant, resulting in more loading times and slow Angular performance. Reducing the size of images and assets optimize application performance and work efficiently.
You can reduce it by compressing images and utilizing tiny CSS and JavaScript files with tools like Compressor.io or TinyPNG. Additionally, you must consider Angular performance optimization techniques such as progressive and lazy loading.
Another powerful Angular performance optimization technique is using catching to boost loading times. By caching data, you can decrease the number of HTTP requests made to the server and improve application loading time.
Additionally, you can use tools like Angular HTTPClient and Service Workers to implement multiple levels, such as server cache, browser cache, and client-side caching. With a lower loading time, your application can run faster and significantly.
Too many libraries affect performance tuning in Angular applications. Each library adds value to the application, and sometimes it can negatively impact the performance. Also, each library increases file size and slows down its loading time.
Hence, avoiding using multiple libraries that perform similar or identical functions is ideal. Also, you do not have to depend on a set of libraries to perform particular dependable and overhead tasks.
In Angular, code duplication leads to inefficient code and negatively impacts application performance. A code duplication increases your application’s file size and creates functionality issues. For Angular app performance optimization, you should avoid unnecessary code duplication and must write clean, efficient code that is maintainable and reusable.
Additionally, for Angular best practices for performance, use Angular’s built-in mechanisms for dependency injection to share functionality between services and components.
To identify the bottlenecks of performance in Angular applications, it is essential to use code profiling and analysis. You can improve particular tasks by analyzing the code and identifying the areas of inefficiency.
Also, some profiling and analysis tools for improved apps include Angular Angury and Chrome Dev Tools. You can optimize code and improve Angular applications’ performance and user experience using these tools.
With excessive DOM manipulations, you can significantly slow down your Angular application. When you also update the DOM frequently, it will result in increased reflows and repaints, which can affect performance.
To optimize this, minimize direct DOM manipulations and wisely leverage Angular’s change detection strategy. You can utilize OnPush change detection, trackBy in ngFor, and detach changes when it is necessary to optimize performance. Additionally, consider using virtual scrolling to handle large lists efficiently.
Web Workers allow you to run JavaScript code in the background, offloading CPU-intensive tasks from the main thread to enhance Angular performance. It helps in maintaining a smooth user interface without blocking UI interactions.
For Angular applications, you can use Angular’s built-in Web Worker support to handle expensive computations without affecting UI performance. Implementing Web Workers is especially useful for applications dealing with real-time data processing or complex calculations.
Optimizing lazy-loaded modules using a preloading strategy can significantly improve Angular application performance. By default, Angular loads modules only when required, but preloading can enhance speed and efficiency.
You can utilize Angular’s built-in PreloadAllModules strategy to load modules in the background after the main content has loaded. In addition, custom preloading strategies allow you to selectively preload necessary modules based on user behavior, improve performance, and reduce initial load times.
Apart from strategies and tips, the following tools help you to measure Angular performance and bring the best results.
It is a set of tools and features of the Google Chrome browser that provides analyzing and debugging of Angular applications. It includes memory and CPU profiling features and network analysis to inspect and analyze the Angular performance.
Also, you can use the timeline view to visualize the Angular performance improvements and identify potential bottlenecks in real time. Additionally, the tool allows you to inspect your application’s network activity and render HTML.
Angular DevTools is an official debugging and profiling tool designed exclusively for Angular applications. It provides in-depth insights into component interactions, change detection cycles, and application performance.
With Angular DevTools, your developers can inspect component trees, track state changes, and monitor how efficiently Angular’s change detection is working. The tool allows you to analyze rendering times, identify bottlenecks, and optimize performance by minimizing unnecessary re-renders.
The open-source tool from Google helps you audit the performance of Angular applications, best practices accessibility, and SEO. Lighthouse provides a detailed report of the application’s performance with actionable insights that help to optimize speed.
The Lighthouse measures the website or web application’s responsiveness time. It includes performance metrics, such as time to interact, total blocking time, and contentful performance. It can also simulate numerous network conditions to test performance.
It is a free online tool that allows you to test application performance from various locations and browsers worldwide. Using WebPageTest, you can measure the application’s loading speed and detect Angular performance issues.
The tool provides insightful reports on speed, loading time, and render time. WebPageTest provides a wide range of advanced metrics to measure Angular application performance, including time to first byte and paint.
It is a tool designed to analyze and measure the performance of Angular apps. Angular Performance Explorer provides insights into rendering, change detection, and visual interfaces for exploring the performance metrics of your Angular application.
Also, it includes memory usage, network requests, and CPU for optimizing code and summaries the potential issues along with the solution. The tools also provide recommendations, such as optimizing change detection strategies and lazy loading modules.
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Angury is a Chrome extension specifically designed for debugging and profiling Angular applications. It helps developers to visualize component trees, track component states, and inspect dependency injection hierarchies.
With Angury, you can analyze how your application’s change detection is working and optimize it for better performance. Additionally, it allows you to explore routing modules, view event bindings, and debug application structures with ease.
NGX Tools is a powerful set of uses to tailor your Angular applications. It offers a comprehensive suite for analyzing performance and optimizing applications. It provides insight into runtime performance, bundle size analysis, and optimization of module structure.
By leveraging NGX Tools, you can inspect lazy-loaded modules, track memory usage, and minimize excessive rendering, ensuring an optimized and efficient Angular application.
Web Vitals is an initiative by Google that focuses on key performance metrics affecting user experience. It provides critical insights into Core Web Vitals, including Largest Contentful Paint (LCP), First Input Delay (FID), and Cumulative Layout Shift (CLS)—all of which play a crucial role in Angular performance.
Using Web Vitals, you can measure real-world application performance and optimize speed, responsiveness, and visual stability to enhance the user experience. The tool effectively ensures your Angular application meets modern web performance standards.
To stay ahead of the curve, you must know how to optimize your Angular applications. You can enhance application performance by implementing strategies, tips, and tools. Prioritizing Angular performance apps lead to a faster, more efficient, and user-friendly application, which is critical for every successful business.
If you are looking for a helping hand to enhance the performance of the Angular app, then connect with us today to hire Angular developer of your choice with the desired skillset.
There are numerous ways of Angular performance optimization in your existing application. But the best way to tune your application is Lazy loading. It allows you to split bundles and modules to reduce memory usage.
The best practice to improve the quality of Angular code is to try centralizing state management, avoid logic out of the module, and use the right Async code.
Below are the best possible ways that are worth considering to increase the page speed of your Angular application:
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