mobile app development

The Guide To Improve React Native Performance in 2021

Improve react native performance with these steps to maximize the user experience!

Improve the Performance of a React Native App

The Guide To Improve React Native Performance

Improve react native performance with these steps to maximize the user experience!

React Native development trend has already gained a lot of popularity since its initial release. Developers love this framework because it provides speed, and enhanced productivity. However, if not handled properly, these cross-platform apps can have some performance issues. 

In this article, we will discuss some tactics which might result in react native performance improvements. Moreover, we will also throw some light on possible reasons behind these issues.

How Do React Native Apps Function?

Well, if you are new in the world of app development, you might want to know about elements that make the react native apps function. Let’s discuss them before we proceed further and talk about react native performance tips. 

React Native Apps work with three threads basically:

  • UI Thread or The main Thread - The Main Thread takes care of the UI. In other words, the main thread is responsible for components users see and gestures the user makes.
  • JavaScript Thread - However, React native executes JavaScript code in a separate JavaScript engine after each action taken on the app. It decides how an action was taken on User Interface behaves.
  • The Shadow Tree Thread calculates the layouts defined on the JavaScript. Later, it sends this information to the native side of the app to create a view.

React Native Apps consist of :

  • Native components that use Objective-C, JavaScript, and Swift;
  • React Native is built entirely on JavaScript and executes scripts.

How To Improve React Native App Performance?

When we have understood React Native Apps a little bit, let’s talk about the real deal now. React Native Apps can have various performance issues. Even though building these apps is faster, and you get the freedom of adding as many features as you want, there are still some issues that might occur during the executions of many processes within the app.

However, make sure that optimizations and solutions which we will talk about further, you are not using prematurely. Try these solutions only if a real problem is visible, making premature optimizations may make things worse.

1. Rendering Issues

While your app requires features but adding unnecessary features might result in unnecessary rendering. Too much rendering might cause frame drops and screen lags. In other words, if you scroll through your app too fast, you will realize sometimes the UI gets blank. This is because of the slow rendering. 

Slow rendering might cause flickering in the UI, slow processing, or even termination of the app. Rendering issues might have two obstacles standing between react native app performance.

  • Controlled vs. Uncontrolled Components:

Sometimes, either the device is slow or the user types faster. It might reduce the speed of UI react and data might flicker. Well, the issue lies with the order of the operation. 

Solution- To solve it, you should remove the value prop from TextInput entirely. It will fix the data flow individually, from the native side to the JS side. Hence, synchronization issues will be eliminated.

  • Global State:

A bad global state management design can cause slow rendering. Especially when state change of TextInput or CheckBox controls rendering of the whole application. 

Solution- Using specialized libraries like Redux or Overmind.js to handle state management can optimize the performance. 

Moreover, applications can be optimized on a Single-component level as well by using Pure Component and memo wrapper for function components. It will take some time but surely give your app the freedom from re-renders and improve app performance.

2. Memory Leak

A memory leak is a situation where your app gets laggy or freezes the screen due to a lack of RAM, or unnecessary background processes. Moreover, there are ways of locating these leaks to improve react native android performance by eliminating them.

Using XCode to find leaks:

  • Find XCode > Product > Profile
  • Select Leaks

Use Android Studio to find memory leaks:

  • Start React Native app
  • Run Android Studio
  • Go-To Tools > Android > Enable ADB Integration
  • Click on Tools > Android > Android Device Monitor
  • Now click on Monitor > Preferences
  • Use Preferences monitor to identify memory leaks

The Solution for react native performance improvements

Well, to solve this problem, it is recommended for you to use scrolling lists such as SectionList, FlatList, or VirtualizedList. Moreover, these lists can be used in some cases like:

  • If you want to build infinite scroll pagination;
  • You need to build a pull to refresh action in the react native app;
  • And you want to improve the app rendering performance.

3. Image Size Problems

The image size can create issues due to their memory consumption. To solve this and improve app performance, certain ways can be followed.

a. Reducing Image Size can decrease the memory consumption

Reducing the size of images can result in a better app performance as it will require less space usage in the device. Moreover, using heavy images also slows down the loading time.

  • Compress SVG images through GZip;
  • Remove imc. Local Image Cachingage metadata;
  • Resize images according to the target screen sizes;
  • Keep images as less as possible.

b. Convert images to WebP format to save loading time

WebP format can help you in reducing the loading time of the image by up to 28%. Moreover, it can reduce CodePush bundle size by 66% and along with the Android and iOs binary size. Using this technique can turn navigator transitions smoother and improve react native app performance with a good margin.

c. Local Image Caching

Image caching enables apps to save pictures offline to save loading time of apps. However, this function is only available for iOs phones at the moment.

4. Navigator Transitions

Slow navigator transitions can occur while users try to render a new screen in the middle of the animation. It tears the animation and blocks the JavaScript thread.

The solution to optimizing react native app

Well, using an interaction manager can be beneficial to make the process smoother and it can improve the performance of your app.

5. Including Maps in React Native Applications

Well, if your app requires the map feature for any reason, it might slow down the react native application. However, some actions can be taken to optimize react native apps and boost their performance.

The solution to improve react native performance

While integrating the map feature, there are two steps that you should take to improve react native app performance:

  • Remove Console.log to avoid it from storing any data in XCode;
  • Disable the auto-update of Geographical locations.

6. Multithreading or Multiple Services

Well, react native apps do not support multithreading. In other words, react native apps can only run one service at a time, so it will not be useful for you if you are building an app that requires multiple components to run in parallel.

React Native Performance Tips For This Situation

It’s simple, if you require multiple threads in your app, react native is not a technology you should use. In shorts, choose an app-building technology that will let you use multi-threads while building the app. Take Twitch as an example, they had to move from React native technology as they could not combine live video streaming and chat services altogether.

7. Library Errors in React Native Apps

Sometimes, React Native Firebase libraries may cause some errors like “FirebaseCore.h not found” or “Firebase. h not found”. It might be due to the reason that your library was not properly installed or corrupted.

Solution For React Native Improve Performance

Well, the solution is simple, all you need to do is to re-install and re-link your library. However, make sure that you relink it manually not automatically.

8. App Registry Error

Some beginner developers can face this simple error due to a very small mistake. It will display pop-ups like “Your App is not registered”. The problem might exist in the core process while designing the app.

Solution react native performance improvements

Well, simply correcting the application name in its app.json file can cure the issue.

9. Module Could Not be located

Sometimes while creating a JavaScript file, you might misplace it due to any reason. At the time of the launch, this error might occur because of the same. 

Well, all you need to do is to edit the file path and provide the right one and your app will start working again.

10. Large App Sizes

Using external libraries affects the size of an app. It also depends on how many files you are going to add while building the app. Therefore, some ways can be used to optimize app sizes like reducing graphic sizes, using fewer features, etc.

The solution to optimize react native app

To begin with, you can use ProGuard. It lets you optimize application sizes according to the architecture of various devices. Moreover, you can move components from the native realm to the react native realm. It will improve the app performance by reducing the application size which ultimately results in less load on the bridge.

React Native apps can be very useful if you are looking for ways of building apps in less time and cost. However, if you are an individual developer and you want more guidance and training to build react native apps, you can contact top react native app development companies. They might agree to train you for this process.

We hope that our article was useful for you. For more app-related blogs, keep visiting MobileAppDaily!

General FAQ

  • How can I make my react app faster?
  • Is React Native slower than native apps?
  • What can you build with React Native?
  • Can you build a Web app with React Native?
Aparna <span>Growth Strategist</span>
Written By
Aparna Growth Strategist

Aparna is a growth specialist with handsful knowledge in business development. She values marketing as key a driver for sales, keeping up with the latest in the Mobile App industry. Her getting things done attitude makes her a magnet for the trickiest of tasks. In free times, which are few and far between, you can catch up with her at a game of Fussball.

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