10 Ways You Can Enhance the Performance of Your Angular App

Improving Change Detection

Change detection is a phenomenon requiring a higher level of accuracy and awareness to work on the performance capability of Angular apps. It is useful to understand the preliminary necessity of rendering the templates efficiently. It also helps you gauge the requirement of the component to be added to the template or not. So, what would you do with OnPush change detection?

OnPush Change detection :

An asynchronous event may occur to angular apps. Angular would suggest for re-rendering that feature. The functionality has a connection with a default change detection behavior for the components. Different events such as XMLHttpRequest, interval, dom event, click and setTimeout can arise for angular, and hence they require re-rendering. Angular runs an inspection using OnPush change detection component to find if changes have occurred to values and understand if they need to be updated.

OnPush Change Detection allows for re-rendering of the template under certain conditions. They are as follows as below:

• Explicit run of default change detection
• A new reference added to one of its component properties
• An event from the component

However, Angular runs a check to find if every component has been affected due to changes. Despite, this default action by Angular, it is not enough to improve the performance of the applications and your application may become slower. But, we can do this manually upon observing input changes. As a result, we can skip the default OnPush change detection behavior by Angular, and do it manually to boost its performance.

The manual practice is useful to improve performance of large and complicated applications since the change detection is highly susceptible to skip the components. In certain situations, components do not get updated due to ChangeDetectionStrategy.OnPush. As a result, it restricts the updates. Due to this, you have to needlessly re-render your component. The difference between default updates and manual updates can be viewed using rendering dev tools by Chrome. The “Paint Flashing” helps understand this attributes.
Many a time, when components are not getting updated, you can leverage RxJS with OnPush because working with OnPush alone for angular performance boost is quite tough. It is recommended to use OnPush along with RxJS and the async pipe. Using these code bases, you can predict the process of performance boosting capability.

When you use OnPush along with RxJS and async pipe, your angular app becomes super- performant.

Provided NGRX, it is one of the primary and useful state management libraries. NGRX with RxJS make it easy to work with Angular app by extracting observable data from the store. When applying a reactive state management solution with NGRX, you can easily use OnPush change detection component.

Lazy Loading Modules

Different types of applications have different types of attributes to their products. For example, most applications have more than one page including its service page, about us page, login page and so on. During navigating through a certain service page, your browser will load all the pages along with their codes that may be irrelevant for users. You can prevent your users from loading unnecessary pages with the features built in Angular, which is available in its router. And to do this function, you must work on lazy loading modules. Depending upon its criteria, you can lazy load a page if it has NgModule. This feature would allow you to import the RouterModule. At the same time, if you use the forChild function, you will be redirected to its own routes.

An Angular Development Company always recommends not to lazy load the default route or the landing page. If your user does not get enough of your service information and has to wait for an additional request, it can impact your brand image.

Trackby Function

For directive allows for rendering a huge volume of templates. But, this involves traversing your path with the manipulation of the DOM task. Usually, the task is quite tough and expensive as well. To make an equality check run, you can use For directives. By default, this component checks if templates have changed. With simple primitives such as numbers and strings, there is no difficulty in understanding their status. But, as you want to work on lists of objects, it gets a bit complicated.

For carries out equality check depending on reference and not based upon the properties within them.

In this context, when you apply the Redux style platform to run immutability, the list of objects changes and they appear as one. Interestingly, the reference of the objects in this architecture changes whereas its content remains the same.

Due to the default behavior of the Redux style platform, it creates confusion for *ngFor during an equality check. It thinks the entire list contents of the list objects have changed. This results in the re-rendering of the object. In such a case, your angular application becomes slower and its performance level dips. Hire angular developers that can help you in this complicated task and improve the performance of your Angular application.

trackBy function is an efficient and simple way to work on this performance booster of the application. To identify if the lists of objects are the same or different, this function can help us greatly. Extracting cues from unique ID from objects, we can understand and assess the level of changes to these objects if there is any.

Use For directive, the feature can help you perform an important update to the application.

Disable unnecessary CSS class and comment directives

You have to decide if CSS Class and comment directives are important for your project. If they are no longer important, you can disable them. These two components can intervene with the angular app performance.

The Mean Stack development experts are well versed in this technique and they can suggest better modification or improvement tips for your angular apps.

Gzip Compression

Using Gzip Compression, it can help you compress the size of the body of the web pages. With this, you can increase the angular web app speed. Hence, it is necessary that you have applied the function and enabled it in the backend.

AOT compilation

Angular uses JUST IN TIME (JIT) compilation while running production build. It shows Angular processes your inputs at runtime.

This action has two negative impacts. Much before your application is used, the compilation process starts working. The loading time of your app in the browser is dramatically increased too. Secondly, it forces us to ship Angular compiler, which is quite tough due to its large volume of modules.

But, using AOT (ahead of time) compilation, we can set out time once when developing our application. This does not ask for transit of the Angular compiler. Instead of that, it only requires sending complied templates. With this, we can reduce application of Angular compiler, while skipping the compilation procedure. As a result, the whole act increases the loading time of Angular application into the browser.

Server-side Rendering

This is a technique to work on the indexed pages. So, the Angular apps that contain indexed pages must be server-side rendered. The application of the process is unique to render index pages to its fullest capacity much before being loaded to the browser. As a result, it improves loading capacity of the pages in the browser. However, remember the process only works when Angular app has no connection with the native DOM components. It is better you use document from the Angular providers.

Optimization of actions for improved UX

Improving optimization of your app is essential to ensure its performance. It is an important aspect to work on with. If not paid attention to, it impacts your user experiences the most. Optimizing actions such as error handling in EFFECT or using CACHED DATA, you can work to improve UX.

Another key action can be utilized to improve the overall performance of your Angular application. This is known as Optimistic updates. This is a function that appears as an update in the user interface prior to being saved on the server. The users using this feature can have a snappy native-like experience. At the same, the server would process the request without any error. However, even after the UI update, if there is any error, we need to take that update back.

Updating Third Party packages

When it comes to improving the run time performance of your Angular application, you should run updates for third party packages. This is a small process but quite helpful to resolve the performance issues of your application.

Progressive Web Apps

Not only does PWA optimize load time, but it also helps optimize run time too. As a result, your application becomes fast, scalable, responsive and interactive.

Takeaways

We have listed some of the best Angular application performance booster tips that are followed by the expert angular development services like Bytes Technolab . Every comprehensive action requires precision and in-depth knowledge about the angular application to identify bottlenecks to resolve issues. So, it is imperative to check on the issues from the beginning as mentioned here. If you try anything else with your angular application, it may cost you time and effort. You should leave the responsibility upon conversant and well known Angular application Development Company. Hire Angular developers to improve the user experience of the application and build a better connection with your client to optimize your ROI.