Memory usage is an essential factor for every application, and Angular is no exception. An application’s memory usage can impact its functionality, stability, and, most importantly, end-user experience. In this article, we will dive into some tips and techniques that developers can use to optimize their Angular apps’ memory usage.
Before we dive into optimizing your Angular app’s memory usage, it’s essential to understand how Angular manages memory. Angular uses a technique called Garbage Collection to manage memory. Garbage Collection is a process of automatically freeing up memory that is no longer needed by an application.
Angular’s Garbage Collection process works by marking objects that are no longer needed and sweeping through them periodically. This process ensures that the application does not use any more memory than necessary.
While the Garbage Collection process in Angular runs automatically, it’s essential to keep in mind that the process can cause performance overheads. Therefore, optimizing your Angular app’s memory usage will improve your application’s overall performance as well.
Data Binding in Angular is a powerful feature that allows developers to build dynamic and efficient applications. However, using data binding excessively can also lead to increased memory usage.
One way to reduce unnecessary data binding in your Angular app is by using the OnPush change detection strategy. OnPush change detection tracks changes to an object’s reference rather than the object’s properties. This approach significantly reduces change detection overhead and, as a result, the overall memory usage of your Angular app.
Lazy loading is another technique that developers can use to optimize their Angular app’s memory usage. This technique involves loading code fragments only when they are necessary, rather than loading an entire module upfront.
Lazy loading helps optimize memory usage by reducing the amount of memory your app needs when it first boots up. Instead, the app loads only what it needs at that moment.
To lazy load modules in your Angular app, you can use the loadChildren property in your app.routing.ts file. By doing this, you can divide your app into small, reusable code chunks that load only when needed.
On-Demand Components is a feature in Angular that allows developers to lazy-load components dynamically. You can use On-Demand Components to alleviate memory pressure by loading components only when they are needed.
On-Demand Components are especially useful in scenarios where you have large components or grids. By loading only the components that the user needs, you can still provide a great user experience without using up too much memory.
The HttpClient module in Angular is a powerful tool that simplifies making API requests in your app. However, if used excessively, it can also cause your app’s memory usage to skyrocket.
To optimize your Angular app’s memory usage with HttpClient, you can use RxJS operators such as take and takeWhile. take and takeWhile limit the number of emitted values from an observable. By using these operators, you can reduce memory usage by preventing HttpClient from emitting too many values and buffering too much data.
Another way to optimize HttpClient is by ensuring that you receive only the data you need from an API response. Instead of receiving an entire data object, try selecting only the fields you need using the map operator.
Server-Side Rendering (SSR) is another technique that can help optimize your Angular app’s memory usage. SSR pre-renders your app’s UI on a server before sending it to the client. This approach improves performance, reduces load time, and improves SEO.
By pre-rendering the HTML on the server, your Angular app loads only what it needs at that moment. This reduces the amount of memory your app needs on the client-side and, as a result, helps optimize memory usage.
In this article, we’ve looked at some tips and techniques that developers can use to optimize their Angular app’s memory usage. By reducing the number of unnecessary data binding, using lazy loading modules and on-demand components, optimizing Angular’s HttpClient, and using Server-Side Rendering, developers can improve their app’s overall performance, stability, and user experience.