Angular is undoubtedly a high-performance framework that lets you build fast apps. But if you do not follow the Angular performance best practices and some techniques, your app can become slow. In other words, if your coding styles and techniques are bad, achieving high-performance will be difficult.
By boosting your app’s performance, you can boost your business. When your app performs well and runs smoothly, users will love to use it, which will be a great business advantage for you because when they start loving your product, they’ll become regular users and will also recommend people to use it. Thus, by improving your app’s performance, you can get more customers and earn more profits in your business.
In this post, I’m going to give you 10 simple tips to improve Angular performance. I hope that after implementing these useful tips, you’ll be able to boost the performance of your Angular app. So let’s start!
1. Use fewer watchers
Do not use too many watchers if you want to improve Angular performance because they make the digest cycle longer. Using several watchers will decrease the performance of your app. So limit the use of watchers in your Angular project.
2. Make the digest cycle shorter
Longer digest cycles will make your app very slow. So always try to make them shorter. The shorter it is, the better the performance your application will have. Just by taking a close look at your app’s digest cycle, you can tell about the performance of your app. A short digest cycle indicates the Angular app will run fast.
3. Find performance issues using Chrome DevTools
In order to optimize the performance of your Angular app, you need to know exactly why your app is slow. You need to find the performance issues before fixing them because if you don’t know what the issues are, you can’t fix them. So first of all, you have to find performance issues, which you can do using Chrome DevTools such as Timeline and CPU Profiler. These tools will help you improve the overall performance of your Angular app.
4. Disable comment directives and CSS class if they’re unnecessary
Comment directives and CSS class can make your app a little slower. So if you think you don’t need them, it’s better to disable them. But if they are necessary for your project, keep them.
But disabling comment directives and CSS class will be better if you think that they are unnecessary in your Angular project.
5. Have small DOM trees
Frequent access of DOM can slow down your app. The less you access the DOM from your project, the better because accessing DOM too many times will result in poor performance of your app. So always try to have small DOM trees. And if possible, do not change the DOM.
6. Use smaller variable scopes
Large variable scopes also cause poor performance. So always try to have small variable scopes. Tight scoping of variables allows the garbage collector to release memory from time to time.
7. Make use of Lodash
Lodash can help you improve your app’s performance significantly. It allows you to rewrite the logic of your app to enhance the Angular’s built-in methods. In this way, you can greatly speed up your app. So make use of Lodash.
8. Debounce ng-model
Debounce ng-model because when you do that, the digest cycle gets limited as a result, which greatly improves Angular performance. So you should debounce inputs with ng-model. It’s a great way to make your app a lot faster.
9. Minimize the use of ng-repeat
When you use ng-repeat too many times, it can cause performance issues. Instead of using ng-repeat, you can use its alternatives. For example, for rendering global navigation, you can do it through the $interpolate provider instead of using ng-repeat.
10. Use performance tools
It is highly recommended that you use good performance tools for your Angular app in order to find performance issues. These tools will help you improve the overall performance of your app.
The best performance and testing tools are listed below.
- Batarang: Batarang is a debugging tool. It’s a Chrome extension that has been developed by the Angular team. It’s extremely useful for tracking performance benchmarks.
- Protractor: Protractor is an amazing testing tool developed by the Angular team. Using this tool, you can run tests in a very flexible manner. This tool will help you improve performance amazingly.
Other performance and testing tools which are popular among Angular community are NightwatchJS, WebDriverIO, TestingWhiz, etc.
Besides these tools, you’ll find many other interesting and useful tools on the Internet, which can make your coding work at lot easier while giving your app a performance boost.
In this post, I have briefly talked about how to speed up your Angular app. Besides these Angular specific tips, you can also follow the general performance best practices to improve the performance of your Angular app. There are a great number of learning resources on the Internet regarding Angular performance, which you can use to learn how to make your app faster. The official site also offers lots of useful study materials and tutorials, which will help you to become a better Angular developer.
You have to constantly look for ways to improve your app’s performance. You can get your project reviewed by Angular gurus who can take a close look at your codebase and can say exactly what you should do to take the performance of your app to the next level.
You can also ask Angular experts for advice regarding how you can speed up your Angular app. You may share some information regarding your project and ask performance related questions to experts using QA sites such as StackOverflow and Quora.
My point is that you have to learn about performance a lot. The more you learn about Angular performance, the more you can improve your app’s speed. It has become essential that your app is fast enough. So if you want to achieve success with your app, you need to find effective ways to take your app’s performance to the next level. Among several other available online tutorials, here’s an Ultimate Guide to Angular 7 explaining you everything about the same.