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Angular, one of the widely adopted JavaScript frameworks has been used in the development of SPAs for large-scale enterprise applications. At the end of the development process and during the maintenance, angular performance optimization is done with the intent to provide the best possible user experience.
In this blog, we have discussed some of the best tricks & tips to tune the performance of your angular apps.
Why Performance Optimisation In Angular Optimisation Is Necessary
Performance is one of the most important metrics of any angular application. It is even more important for Angular applications because there are many things that can go wrong in the browser or in the coding due to its complexity.
Following are reasons to optimise your Angular app:
- Optimizing will make your application load faster on a slow connection, and it will also make your app feel more responsive to the user.
- It will reduce the number of errors that you get in your browser console, which means less time spent debugging and more time spent developing new features.
- Helps you to save money on bandwidth costs because you won’t need to send as much data over the wire, which means less data usage and lower bills.
How To Optimise The Performance Of Angular Apps
Angular is a JavaScript-based open-source framework for building mobile and web applications. It helps developers to build apps with a single codebase. Before knowing how to optimize performance, first, let’s understand what is meant by performance in the context of Angular apps.
Performance can be defined as the speed at which an application responds to user interactions or the number of resources consumed by an application while running on a device or server.
Performance is important because it affects user experience and can have a significant impact on revenue generation from your app.
Also Read: 8 Modern Website Design Trends to Inspire You in 2022
Following are the performance optimization tactics that you should implement in your angular application:
Lazy Loading
In Angular, lazy loading is a feature that allows you to load Angular modules on demand. This means that you can load only those parts of your application that are needed at any given time, which can significantly reduce the initial load time of your application.
The idea behind lazy loading is that some of the content on a webpage may not be needed immediately, so it’s better to load it when it’s needed rather than loading everything at once. This will also help with bandwidth and server usage as well. Another advantage of lazy loading is that it allows for a smoother application experience.
Following are the advantages of lazy loading:
- It improves page performance and reduces page weight
- It makes web pages more responsive
- It provides a better user experience
Implement AOT Instead Of JIT Compilation
The JIT compiler in Angular compiles JavaScript code to native machine code before executing it. This process takes place at runtime, which means that the compiler will compile the code as needed and execute it when required.
It is that it improves the performance of your application to some extent by executing only those parts of your code that are needed at runtime. This means that you will not have to wait for all the code to be compiled before starting your application, which in turn means faster execution times and a better user experience.
Disadvantages of JIT compilation:
- Since the compiler is in the browser, it increases the application size, which affects the user experience
- It is impossible to track template binding errors during build time
On the other hand, AOT compilation in Angular enables faster loading of the application as it compiles the code on the server-side before sending it to the client. This compilation process can be done using a command-line tool called ngc or using a build system like Grunt or Gulp.
With AOT compilation, the Angular compiler compiles the code into an intermediate language that can be executed by a virtual machine.
This compilation process is what enables Angular to perform faster start-up times. It is also able to provide much better debugging, testing, and profiling capabilities as this compilation process can tell what code was executed at any point in time.
Advantages of AOT compilation:
- As the browser downloads a pre-compiled version of the application, rendering is faster
- The application is much smaller because it doesn’t have a compiler
Tune Into Server-Side Rendering
Server-side rendering is a technique that can improve the performance of an Angular app. It is not a new concept, but it has been gaining traction in recent years.
The main idea behind server-side rendering is to render the HTML on the server and send it to the browser instead of rendering it on the client-side. This way, when a user visits your site, they will get an instant response without having to wait for JavaScript to load and execute. The server-side rendering process consists of understanding the current URL, retrieving the HTML for that URL, sending it to the browser, and waiting for a response.
Use Pure Pipes
Angular consists of pipes; it is used to slice the data for display purposes. It comes in two types:
- Pure pipes – Produces similar outputs for the same inputs
- Impure pipes – Produces different outputs for similar inputs
The inbuilt pipes of Angular are pure in nature. It helps in the evaluation of the same expression. This won’t be enough in the case of enterprise applications, so implementation of memorization is required. It aids in caching values.
Pure pipes help in the evaluation of the same expression a number of times. Talking about enterprise applications, the use case is a bit complex, and we require something more; thus, you should implement memorization. Pure pipes along with memorization multifold performance benefits.
When a value is processed, it gets cached. Next time if the same value gets repeated, then it is fetched from the cache.
import { Pipe, PipeTransform } from ‘@angular/core’;
import { DecimalPipe } from ‘@angular/common’;
import { UtilityService } from ‘../services/utility.service’;
let cache = {}; // caching variable
@Pipe({ name: ‘calculateAmout’ })
export class CalculateAmoutPipe implements PipeTransform {
constructor(private utilityService: UtilityService, private decimalPipe: DecimalPipe){
}
/* Calculate and save the value into the cache, and return value from cache.
It could save some iteration of calculation by memoization */
private calculateMemoize = (val) => {
if(!cache[val]) {
cache[val] = this.numberFormat(val);
return cache[val];
}
private numberFormat = (value) =>{
var result = this.utilityService.calculateBalance(value);
return this.decimalPipe.transform(result, ‘.0-0’)
};
transform(value: any, args?: any): any {
return this.calculateMemoize(value);
}
}
Over To You
So these were the top tips & tricks to optimize the performance of your angular apps. With the application of these tips & tricks, we are sure your angular app performance will enhance significantly.
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