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How to Optimise the Performance of React Native Apps 8 Key Tips

React Native remained one of the most popular libraries for building high-performance cross-platform apps. The fast loading capability of React Native apps made the library so famous among development companies worldwide. If you want to develop your application quickly without undermining the performance score and capability to render native functions, React Native is the ideal development technology.


But there are certain time-tested principles to boost the performance of React Native apps. As a developer if you are not aware of those principles and tips this short list of useful tips may help you.


Start with the React Native documentation to boost performance


React Native developed by Facebook boasts of very rich documentation, and there you find several essential tips to boost the performance of your app. Just look for the following information in the React Native document.


●    Detailed information on both the JS and UI threads of the application built with React Native

●    A detailed guidance for maintaining 60fps frame rate

●    The key issues and bugs responsible for pulling down performance

●    The list of components the developer needs to use to boost performance



Use Scrolling List to prevent Memory Leakage or to refresh frequently


With many Android applications, this is often a common problem. It is because a vast majority of Android apps concurrently run several processes many of which are unnecessary. To address this issue conclusively, developers need to take help from the scrolling lists instead of falling prey to Listview. Some of the scrolling lists that they can use include FlatList, SectionList, and VirtualList.


There is also another benefit of using the Scrolling list. It helps to ease out the infinite scroll pagination. It is particularly useful for apps that use Pull action on the screen for refreshing contents and features. For example, news, media and content-rich apps that gets updated frequently may need refreshing frequently, and for them it becomes useful.


Addressing app size differently for separate devices


React Native is a JavaScript library and like JS libraries it also relies tremendously on integrating several third-party libraries and native components. Too many components and third-party libraries end up making the application size bigger. This requires reducing the app size by optimising resources. It is advisable to use tools that can reduce the size of the app as per the devices. Such tools achieve this by compressing the graphics and visual elements.  


Ensure stability when passing on components to React Native environment


JavaScript is known to have elements that bridge the native and web components. Now for web developers dealing with React Native, this may be a little challenging to bring together both web and native code threads. But you require to do this when transferring the native components to a React Native environment.


As for the tried and tested practices, you need to check the stability of all open source third-party libraries and should stay away from using libraries with Boilerplate codes that can bring down the performance. You also should not pass on the components that are heavy enough to slow downloading speed and performance.


Stick to only the minimum and useful


Another proven way to boost the performance of a React Native app is to stick to only the bare minimum essentials. Mainly when using graphics and visuals ask what purpose they are going to serve for the app contents or usability? If the usability only demands 100 points of data, you should not force-feed 200 points. Often performing an API call requires much fewer data points than what the API comes packed with.


Stay away from meaningless rendering


Often by re-rendering components that are not required by the app, developers pull down the application speed. You should control re-rendering by simply using the shouldComponentUpdate function.


Handle large data sets with tools like VirtualizedList, FlatList and SectionList


The inbuilt Lists within React Native like VirtualizedList, FlatList and SectionList are very useful to reduce the volume corresponding to data sets and minimise the memory footprint. This will also help in displaying data perfectly that involves too many rows. All three Lists coming with React Native document helps to optimise the performance easily, especially for apps handling large data sets.


Optimise the frame rate by using Perf monitor


One of the most important ways to boost app performance is to speed up the frame rate and this you can easily do by using the Perf monitor. It is not unusual for a React Native app to slow down when scrolling down or interacting with the app. This mostly happens on the JavaScript thread. This obviously requires detecting the areas where the FPS is dropping. This often happens by setting the wrong state or by allowing in the JavaScript thread a lot synchronous workload.  Wrongly placed redux actions may also cause this.




React Native is already the most performance-driven library for building apps. On top of that, embracing the following tips and principles, the developers can further optimise the app performance.