Optimizing React Native Performance

10 Ways to Optimize Performance of React Native Application

By Harikrishna Kundariya React Native March 9, 2020 8 min read 448 Views

How would you feel if a website takes an unusual time in loading? Disappointing, right? Well, a report says that approximately 53% of the users give up on the website that takes more than 3 secs to load.

React Native, a cross-platform Javascript Framework is categorized as an ideal app constructor that doesn’t disappoint you. It is fast, convenient, and quickly builds a customized application.

Moreover, you can leverage native-like capabilities and build applications for different platforms such as Web, Android, and iOS.

As every coin has two sides, React Native comes with few pitfalls such as lack in modules, which means slower performance. Another factor that hinders the performance is architecture. If there are several tabs, navigators, or animations, then that too may hamper the user interface.

This article will highlight problems and illuminate a few ways to boost the performance of the application.

1. Size of the Application

The Challenge

Heavy apps are the reason behind the slow performance of the React Native application. Applications built using Javascript are often constructed with the help of native components and external libraries. This makes the app’s UI sluggish and larger. Consequently, delivering low performance.

How to Overcome it?

Proguard, a software cum command-line tool that binds the necessary data and removes unnecessary instructions, plays a vital role in enhancing the size of an app. Also, it optimizes classes, fields, methods, and attributes and is responsible for renaming it from meaningless names.

Graphics and images are equally responsible for putting a heavy load on the app. Compressing graphical elements is one of the easiest ways to optimize React Native performance. You can transfer the native components to React Native components for improving the performance.

Moreover, you can restrict the passing of messages from the main thread. These are a few points to consider specifically for reducing the size of the application.

2. Size of the Image

The Challenge

Another hurdle that is accountable for lowering the performance of the React Native Apps is the size of the images. The image size had to be included in this list as it burdens the app memory which is a critical factor in the user interface. The higher the memory usage, the more an app takes time to load.

Optimizing Images in React Native

How to overcome it?

You can reduce the size of an image, but what’s more important is how to optimize the performance. Well, let’s have a glance over a few factors that could help.

  • Reduction in size
  • Compress images using GZip for SVG images
  • Resizing image is suggestable
  • Restrain yourself using numerous images
  • Use PNG format for JPG or JPEG file.
  • Use WEBp converter as it loads images as much as 28% faster . It can reduce the binary size of mobile platforms. Additionally, you can leverage WEBp as it can lower the CodePush by 66%. And, this figure has been obtained from a demo.

Caching image is one of the solutions for improving React Native performance, but it is limited only to the iOS platform. For Android, there are npm libraries for image caching, but that would not deliver expected performance.

3. Memory Leakage

The Challenge

A memory leak is one of the major problems affecting the app’s performance. And this is commonly found in Android. There are memory leaks in iOS as well, and to find out the memory leaks, you can go through the following steps:

For iOS, use XCode:

  • XCode>Product>Profile
  • Select Leaks

For Android, use Android Studio:

  • Open React Native App
  • Run Android Studio
  • Hover to Tools>Android>Enable ADB Integration
  • Click on Tools>Android>Android Device Monitor
  • Click on Monitor>Preferences
  • Use Perf Monitor for detecting memory leaks

How to overcome it?

Scrolling lists like FlatList, SectionList, or VirtualizedList can be your one-stop solution for enhancing React Native performance. This will eradicate memory leakage from the applications. Moreover, you can reap the benefits of the scrolling list as it can make the myriad scroll pagination smooth and swift.

4. Maps

The Challenge

Maps contain navigation and dragging features which could probably pose an issue of slowing down. This may hamper the React Native App’s performance.

How to overcome it?

To boost the performance, you can remove the console.log and impose a restriction on storing data in the XCode. Also, you can deactivate the live update of locations. This way it will lessen the load on Javascript thread which will automatically improve the performance.

You can learn how to build a smart and effective application on location-based travel guide with React Native. The article will help you understand the best use of maps and other technologies.

5. Rolling out App

The Challenge

The launch time of the application attracts the major attention of the users. If it is slow it can deter the users and you may end up losing potential clients. Therefore, you should find a way through which your app opens up quickly.

How to overcome it?

Object.finalize is a key component that incapacitates performance as it runs on a single thread. It pops-up a message of either insufficient memory or app crash even when there is sufficient RAM. Also, it is advisable not to use vital components on the main thread.

6. Enhancement in JSON Data

The Challenge

Whenever you go through any website, it extracts data through the public or private API, which is in JSON format. Now, this data consists of nested objects that slow down the performance of React Native applications.

How to overcome it?

It is recommended to convert the JSON data into simple form to optimize React Native app performance. The conversion tends to speed up and gradually simplifies the rendering.

7. Data Rendering

The Challenge

Rendering is effective, but excessive rendering may harm the performance of your React Native Application. Also, it is advisable not to compile the lifecycles and props as it restricts the passing of information to the Reconciler.

How to overcome it?

Firstly, you should not overload the Reconciler with unused information. It will enhance the Frame Per Second (FPS) output, which will engage the user in the application.

Secondly, the use of ‘should ComponentUpdate’ will only update the required components. It also prevents unnecessary rendering, which hampers performance.

As React Native is single-threaded, it does not allow two components to work parallelly. For instance, you cannot run a camera and calendar together.

Read also: Step-by-Step Guide To Build A Chat App In React Native

8. Screen Orientation

The Challenge

When the device is used in a landscape mode, i.e., taking pictures, playing games, watching videos, and many other functions, then the app crashes. It negatively impacts the review regarding the application, which ultimately results in losing the customer.

How to overcome it?

React-native-orientation was found to be a viable solution, but it has failed to achieve a result in the iOS operating system. It is unable to monitor the orientation lock, which is why the app crashes.

Instead, you can leverage the app’s root view for optimizing React Native performance. This approach can also be used for Creating PWA with React Native where you want to provide mobile-like UX in the browser.

9. Navigation Improvement

The Challenge

Navigation is an imperative function of the applications. If your application fails to respond to the functions or commands ordered by the user, then it is undoubtedly going to lose the competition.

How to overcome it?

Every time you build React Native application, you should consider four key components to deliver smooth navigation to the users. The components are Navigator, Navigator iOS, Navigation experiment, and ReactNavigation.

10. Eliminate the Extra Features

The Challenge

The additional features like tabs, controls, navigations, and animations, can be considered accountable for lowering React Native app performance. It lags the app’s page display time.

How to overcome it?

You can remove extra features to enhance the performance of the React Native application. This will help you only to add vital and necessary features.

Wrap Up

The challenges and effective ways to overcome them is the proof that React Native can fight against all the odds. React Native is a potential and reliable source of building applications. Also, it uses Javascript for app development, which is fast and trustworthy.

If you are looking for a helping hand, then the leading React Native App Development Company could turn out to be your reliable partner. The team of tech professionals would help you achieve your dream of becoming an app owner.

Hire React Native App Developer and share your ideas with him/her. You can appoint them on a part-time or full-time basis, depending on your requirements.

Optimizing React Native Performance

Disclaimer: We at eSparkBiz Technologies have created this blog with all the consideration and utmost care. We always strive for excellence in each of our blog posts and for that purpose, we ensure that all the information written in the blog is complete, correct, comprehensible, accurate and up-to-date. However, we can’t always guarantee that the information written in the blog correct, accurate or up-to-date. Therefore, we always advise our valuable readers not to take any kind of decisions based on the information as well as the views shared by our authors. The readers should always conduct an in-depth research before making the final decision. In addition to these, all the logos, 3rd part trademarks and screenshots of websites & mobile apps are the property of the individual owners. We’re not associated with any of them.

Harikrishna Kundariya

Harikrishna Kundariya

Harikrishna Kundariya, a marketer, developer, app lover, technology savvy, designer, co-founder, Director of eSparkBiz @Mobile App Development Company where you can Hire Mobile App Developer. His 8+ experience enables him to provide digital solutions to new start-ups based on app development.


Follow us

Subscribe Newsletter

Call us Today


Got any Questions?
call us Today!

+1 408 850 1488 [email protected]

Our Guides

Related Post

25 Of The Best React Native Open Source Apps & Projects

25 Of The Best React Native Open Source Apps & Projects

Open-source projects are the best for any company or developer. There is a huge community of peers that contribute to amazing technologies and apps. React…

Exploring The Top 25 React Native Apps Examples (With Company’s Feedback & Results)

Exploring The Top 25 React Native Apps Examples (With Company’s Feedback & Results)

The tech community seems to be more drawn towards apps built with React Native. Some of the native app examples include Twitter, Whatsapp, Google maps,…

React Native Database – How To Choose Right Database For React Native App? (Pricing & Benefits)

React Native Database – How To Choose Right Database For React Native App? (Pricing & Benefits)

Quick Summary:- React Native has recently gained a lot of popularity among developers to build mobile applications. As a result of this, we relatively have good…

Share via
Copy link