7 best practices that will increase React Native performance

React Native is based on JavaScript, the native part interacts with native thread through a bridge. We have three threads running the React Native framework namely: UI thread, Shadow Tree thread, and the JavaScript thread.

Its architecture has two sections; the native part built on Java, Swift or Objective-C and React native part built on JavaScript. you can take a sneak peek on e-commerce app I built using React Native.

In this article, I will explore some of the common best practices you should consider to improve React Native performance.

1. Memory use

Native apps have a lot of unnecessary processes running in the background. Find these with the help of Xcode. The Xcode finds leaks which you should fix to improve performance. In Android Studio, there is an Android device monitor used to monitor leaks in apps. Using scrolling lists like,FlatListSectionList or isVirtualList a sure way to increase performance. Use the following code to monitor performance and to fix memory leaks.

Import PerfMonitor from ‘react-native/libraries/Performance/RCTRenderingPerf’;
perfMonitor.toggle();
PerfMonitor.start();
SetTimeout ( () => {
perfMonitor.stop();
}; 2000);
}; 5000);

2. Reduce Image Size and Image Caching

Images have high memory usage in react-native apps. Using large images in react-native apps have a negative impact on memory optimization. To get optimum results when dealing with images, ensure the use of small-sized images as much as possible. You may also use PNG formats as opposed to JPG image format. Finally, convert your images to web-P format whenever possible because of the following reasons:

WebP images speed up image loading time by 28%
Reduced codePush bundle size by 66%
Helps reduce iOS and Android binary size by 25%
Faster React-native JS thread
Smooth navigator transitions

Cache images locally to reduce the time taken to load images. As of now, React-native support caching on iOS only. See how in the following code:

< image source={ { uri: 'https://facebook.github.io/react/logo-og.png' , cache: 'only-i- cached' , } }, style={ { width: 400, height: 400 } } />

Now, image caching is an important step for improving the performance of your React Native app. It is also a known fact that React-Native supports image caching only for iOS platforms. Image caching can help in swifter loading of the images. App owners may also face the issue of failure of libraries when the preloaded images are not brought in when app is refreshed. This is called cache miss. Performance draining may also occur when cache logic operates towards the JS side.

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7 best practices that will increase React Native performance

Autumn Blick

1598839687

How native is React Native? | React Native vs Native App Development

If you are undertaking a mobile app development for your start-up or enterprise, you are likely wondering whether to use React Native. As a popular development framework, React Native helps you to develop near-native mobile apps. However, you are probably also wondering how close you can get to a native app by using React Native. How native is React Native?

In the article, we discuss the similarities between native mobile development and development using React Native. We also touch upon where they differ and how to bridge the gaps. Read on.

A brief introduction to React Native

Let’s briefly set the context first. We will briefly touch upon what React Native is and how it differs from earlier hybrid frameworks.

React Native is a popular JavaScript framework that Facebook has created. You can use this open-source framework to code natively rendering Android and iOS mobile apps. You can use it to develop web apps too.

Facebook has developed React Native based on React, its JavaScript library. The first release of React Native came in March 2015. At the time of writing this article, the latest stable release of React Native is 0.62.0, and it was released in March 2020.

Although relatively new, React Native has acquired a high degree of popularity. The “Stack Overflow Developer Survey 2019” report identifies it as the 8th most loved framework. Facebook, Walmart, and Bloomberg are some of the top companies that use React Native.

The popularity of React Native comes from its advantages. Some of its advantages are as follows:

Performance: It delivers optimal performance.
Cross-platform development: You can develop both Android and iOS apps with it. The reuse of code expedites development and reduces costs.
UI design: React Native enables you to design simple and responsive UI for your mobile app.
3rd party plugins: This framework supports 3rd party plugins.
Developer community: A vibrant community of developers support React Native.

Why React Native is fundamentally different from earlier hybrid frameworks

Are you wondering whether React Native is just another of those hybrid frameworks like Ionic or Cordova? It’s not! React Native is fundamentally different from these earlier hybrid frameworks.

React Native is very close to native. Consider the following aspects as described on the React Native website:

Access to many native platforms features: The primitives of React Native render to native platform UI. This means that your React Native app will use many native platform APIs as native apps would do.
Near-native user experience: React Native provides several native components, and these are platform agnostic.
The ease of accessing native APIs: React Native uses a declarative UI paradigm. This enables React Native to interact easily with native platform APIs since React Native wraps existing native code.

Due to these factors, React Native offers many more advantages compared to those earlier hybrid frameworks. We now review them.

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Factors affecting the cost of hiring a React Native developer in USA - TopDevelopers.co

Want to develop app using React Native? Here are the tips that will help to reduce the cost of react native app development for you.
Cost is a major factor in helping entrepreneurs take decisions about investing in developing an app and the decision to hire react native app developers in USA can prove to be fruitful in the long run. Using react native for app development ensures a wide range of benefits to your business. Understanding your business and working on the aspects to strengthen business processes through a cost-efficient mobile app will be the key to success.

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