How We Can Improve The Performance Of a React Native App?

These days React Native App development for a business is hot on the charts. But every React Native app is not fully perfect in itself due to some developmental problems at the app developer end. In a report by Google it is reflected that about 53% of visitors leave website or app that takes more than 3 seconds to load. This causes loss of potential clients for the business.

Developing an React Native App  though is not as challenging job as keeping up with the app performance. In this post we will discuss the ways how we can improve upon the performance of your React Native business app, and the problems faced by the app development company/website developer.

React Native App working process

React Native App uses JavaScript, and communicates with the native components of app through a bridge. It depends on 3 primary threads for working.

* The Shadow tree thread

* The UI thread

* The Native thread

The React Native App consists of two main parts I.e the native part that runs on Objective-C, Java or Swift and the other that is built using Javascript.

Major Issues with React Native App

The developers of React Native app are reporting lots of errors and issues in app development if we scan the React Native GitHub page. These issues are either implemental or inherent. The following are the major issues that slow down the app performance.

  1. Issues relating to Memory:One of the major issues is the memory leaks. Particularly with Android  app built with React Native process due to many unnecessary background processes. These leaks can be found using X Code and using Android Studio. The best way to solve memory leak problem is by utilizing scrolling lists like Section List, Flat List, or Visualized List instead of List view. Additionally, the scrolling list helps to make the infinite scrolling pagination smooth.
  2. Problems with Image Size:In React Native apps images contribute immensely to high memory usage. For improving app performance the image optimization is very critical.

To solve the high memory usage problem due to images following steps should be taken

  1. A) Reduce the sizes of the images used: By optimizing the images you can optimize the app performance. Images can be optimized through optimizing image resolution, image size and format. By using GZip compression technique for SVG images , by removing image metadata, resizing images as per right screen size, and using few number of images.
  2. B)  By converting your images to Web P format: Image loading size can be reduced by 23% if we use Web P format as this format helps reduce the Code Push handle size by 66%. Additionally, this can reduce the Android and iOS binary size. The Navigator transitions are a lot smoother and the React Native threads a lot faster if you use them.
  3. C) Through use of PNG format than JPG format:Where the app’s color palette is less than 256 colors like for animations or comics GIF images should be used. Where image scalability is required , the SVG format can be preferred. To offer best performance of app you should play around with image formats and resolutions.
  4. D)  Through Local Image Caching:  Local Image caching feature that is available on iOS helps in caching app images on phone memory and helps load images faster. This can be deployed in the app. For Android, you can use some npm libraries to solve the image caching issues. But there is one issue with both don’t offer the best performance.
  5. By Unnecessary Renders:You can prevent passing too much work to the Reconcile, which my result in the dropping of the thread’s FPS by carefully implement the diff state, life cycle and props. With use of ‘Should Comportment’ life cycle method Boolean you solve this problem. Moreover prefer creating a small numbers of components.
  6. Through Optimizing JSON Data:The Mobile apps always need to load resources from remote URLs and services. And for this you need to make fetch requests to get data from a remote server. The data thus received is by pulling from a private or public API, in JSON format, which consists of compound nested objects. By committing an error of using the same JSON received your application’s performance suffers as JavaScript renders JSON slowly. To solve this problem you should convert raw JSON data to simple objects before rendering.
  7. Very Large App Sizes: Application size is affected as most of developers use external libraries. Reducing the application’s size is all about resource optimization and for this you can use Pro Guard as it helps you to create different application sizes for devices on a different architecture. Further do not forget to compress graphical elements such as images.

You can also move components from the native realm to the React Native realm. The JavaScript components use a bridge to communicate with the native side. Thus by reducing application size you can reduce the load on the bridge, thereby improving the performance of your app.Do not pass on the components that heavily use massage ques when communicating with the native side to the native thread.

  1. By Frozen UI in React Native:The problem is caused when the frozen user interface occurs during a long operation on the main thread , which blocks the UI treads from rendering and this gets worsens when rendering large files, customization animations, raw JSON and map data is there in app. You can fix this problem of frozen UI issue, by avoiding object Finalizes and avoid running heavy objects on the main thread of app.
  2. By Using Maps in React Native Apps:Use of map feature in your app is going to make your app work slower as the navigation and dragging features are quite slow in React Native.  To solve this problem you should remember to remove console.log so that it does not store any data in Xcode and also disable the auto-update of geographical regions. The main purpose of doing this to reduce load time of the JavaScript thread, which improves the map interaction faster and improves the apps performance.
  3. Using Multi threading in the app:The React Native does not support multi threading, which means that you cannot run several services at the same time. Only one component is working in one time and other should have to wait a while the first component is being rendered. To Solve this problem of multi threading in your app you should use a technology that supports multi threading.
  4. By Device Orientation: This problem of device orientation is observed in React Native app and app crash once the screen orientation changes. This results in the loss of users, particularly video and gaming enthusiasts. To solve this your application should listen to the app’s root view.


Other options available with you to Optimize Your React Native App

  1. The first option is through use of Pure Components whose return value is determined by its input and the return value is always the same for the same input values in React Native.

The app re-render in components only when the props changes. In components that are not Pure Component, the should components update life-cycle method and cancel unnecessary re-renders and returns false in certain scenarios.

  1. The second option is through using the Native Driver Animation. The animation library of React Native allows the use of the native drivers and to send animations across the bridge to native side before the animation starts.This make possible the creation of React Native animations and make them good looking also.

The animations use the main thread, that is independent of a block JavaScript thread. This results in a smoother animation and few frame drops. For this reason you should always use the React Native driver as your animation configuration while developing your app.

To conclude we can say that React presents an amazing opportunity to both the mobile app development company in Canada Call +1(408)372-0967 and the mobile app developers to present a amazing app with fewer breakdowns and faster loads. It makes easier for the developer to write your app code in one language for developing an application for both Android and iOS Platform. By adhering to the suggestions you can make your React Native app more faster and vibrant thus achieving your app development goals .

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