There is no denying the fact that React Native is the future of developing hybrid apps. It offers scalability, flexibility, speed, agility, cost-efficiency, and excellent performance when it comes to developing an app. This is the reason why many successful companies rely on React Native for building their applications. After all, in the age of the Internet, every business needs a high-performing app that can greatly satisfy the needs of the customers.
React Native tries to provide everything that is needed to develop a performing application. But, there are occasions when you may feel the need to optimize your app. Here comes the role of opting for professional React Native Development Services that can help you improve the performance of your app by utilizing the best practices.
Even though React Native is one of the top app development technologies, performance issues with your app may arise occasionally, thus it’s important to pay attention to best practices and performance enhancements for your React Native app while it’s being developed.
In this blog, we will discuss some best practices for improving the performance of React Native apps.
Tips for Improving Performance in a React Native App:
Let’s dive deep into the list of some best practices that can effectively improve the performance of a React Native app:
- Use Appropriate Navigation Strategies: There are occasions when developers have trouble navigating React Native apps. Many navigational problems have already been resolved thanks to the big React Native developer community, but some problems still need to be resolved. It occasionally prevents the apps from giving users a flawless experience. Fortunately, there are a number of solutions to these problems, including React Navigation, iOS Navigator, Navigator, and Navigation Experiment. React Navigation is preferred by developers for a wide number of apps regardless of size, while IOS Navigator is only used for iOS navigation development and can only be used to fix navigation issues with small applications and prototype development.
- Avoid Using Scroll view to Render Huge Lists: When it comes to displaying items in React Native with scrollable lists, there are two ways to do it- using ScrollView and FlatList components. Displaying a scrollable list by using ScrollView is simple, but on the other hand, it can directly affect the overall performance of the React Native app especially when there are a large number of items in the list. To fix this issue, experts recommend listing the items with FlatList.
- Avoid Passing Functions Inline as Props: When it comes to passing a function as a property to a component, it is better to avoid passing that function inline. It is because at times when the parent re-renders a new reference, it creates another function. Simply put, the child component re-renders even when the props did not change at all. Hopefully, there is a solution to this. It is recommended to declare the function as a class method or as a function inside a functional component. In this way, you can remove any possibility of removing references across re-renders.
- Go for Resizing & Scaling Images: When it comes to improving the performance of your React Native app, make sure you focus on optimizing images including graphical content or images. When you render multiple images in your React Native app, it may lead to high memory usage on a device. Here comes the importance of optimizing images appropriately in terms of resolution and size. Otherwise, it may lead your app to crash due to memory overload. Some best React Native app image practices include using PNG format instead of JPG format, using smaller-resolution images, and utilizing WEBP format for images for reducing the binary size of your images on iOS and Android by almost a third of the original size.
- Cache Images: Images are the core component of React Native. This component is used for displaying images, but it does not provide an out-of-the-box solution for resolving several issues such as rendering a huge number of images on a single screen, lower performance, low performance in cache loading and image flickering, etc. But still, there are ways to deal with these issues. These issues can be resolved by using third-party libraries like react-native-fast-image. This library works like magic for both iOS app development and Android.
- Avoid Unnecessary Renders: When it comes to avoiding unnecessary renders on the main thread of React Native app, there is an effective optimization technique. You can do it simply by using React .memo() which can handle memorization. Simply put, when a component will receive the same set of properties more than once, it will use the previously cached properties and render the JSX view returned by the functional component only once resulting in saving rendering overhead.
There are several other optimization techniques ranging from using native Driver with the animated library, avoiding arrow functions, avoiding excessive use of higher-order components, avoiding implementing bulk reducers, using style reference correctly, and many more that can help you improve the performance and speed of your React Native app. Though React Native is a popular and high-performing framework, still you should build apps with performance in mind from the very beginning.