Practical Guide to Improving the Performance of React Native Applications
Key Points
- Balance the animation processing of JavaScript (JS) threads and main threads to improve application performance. Use
useNativeDriver
attributes andInteractionManager
to manage this balance. - Avoid unnecessary component re-rendering. Tips include: memorizing components and functions, using
useCallback
wisely, avoiding updating local states with Redux states, and avoiding inline functions. - Optimize images to improve application speed. Use SVG icons and images, WebP image format (lossless image quality), and cache images to speed up rendering.
- Render the project array using stable npm packages and FlatList and avoid memory leaks by logging out the timer/listener/subscribe, avoiding unnecessary use of global variables, and preventing loop object references.
- Drain and monitor performance using analytical tools such as Performance Analytics Tools, Chrome's DevTools, React DevTools, Flipper, and React Native Performance Monitors. Additionally, delete console logs in production mode to enhance application performance.
This article will provide a comprehensive set of tips and strategies to help developers optimize React Native applications to achieve optimal performance and provide an unparalleled user experience.
Animation that balances JS threads and main thread
Anime is a demanding task in any application, and React Native is no exception. React Native uses two main threads: JS threads are used to execute JavaScript code, and the main thread is mainly responsible for rendering the user interface and responding to user input. Animation usually runs on the main thread by default. However, heavy animation workloads on the main thread can cause performance issues such as frame drops.
Solution 1: Try using useNativeDriver
useNativeDriver
is a React Native animation property that can be used when animating elements in a React Native application. When the user sets the value of this property to true
, the React Native application will render the animation on the main thread. However, if the main thread is expected to be busy with other tasks, you can transfer the animation to the JS thread by setting useNativeDriver: false
.
Solution 2: Use InteractionManager
In some cases, both the JS thread and the main thread will be very busy. For example, an application might be fetching API data, executing some logic, and rendering it on the UI. In this case, the JS thread is busy getting data and executing logic, while the main thread is busy showing the UI. Trying to run the animation can cause frame drops and performance issues when both threads are occupied. In this case, InteractionManager
can be used. Start the animation first. After the animation is completed, React Native will call InteractionManager.runAfterInteractions
to execute the JS code. The JS code will then call the API and display the data on the UI. This method helps to avoid overloading of JS threads executing JS code and animations at the same time.
Avoid unnecessary re-rendering
Avoiding unnecessary re-rendering in React Native is critical to maintaining optimal performance. Whenever the application re-renders, the JS thread creates a JS bundle file and passes it through the React Native bridge, and then hands it to the main thread. The more re-renders the application, the more passes occur between the JS thread and the main thread, which will degrade the performance of the application.
Solution 1: Memory Component
React.memo
is a higher-order component provided by React to optimize function components by preventing unnecessary re-rendering. When wrapping a function component with React.memo
, React will remember that component, meaning it will re-render the component only if the component's props change. If props between renders remain the same, React will reuse the results of the previous render, thus avoiding the cost of re-rendering the component.
Solution 2: Use the useCallback function wisely
When a parent component sets a callback function for its child component, the callback function is also recreated whenever the parent component re-renders, resulting in a new function reference being returned. Therefore, the child component treats it as a change in the callback function value, causing it to re-render, even if React.memo
is used. To mitigate this, you can use useCallback
to prevent recreating function references on each re-render of the parent component.
Solution 3: Try to avoid updating local status with Redux status
Solution 4: Memorize the function result
Solution 5: Avoid inline functions
Optimized image
Optimizing images can improve application performance.
Solution 1: Use SVG icons and images
Solution 2: Use WebP Images to get lossless image quality
Solution 3: Cache images to speed up rendering
Use stable NPM package
Use stylesheets to component
Use FlatList to improve performance
Avoid memory leaks
Solution 1: Log out timer/listener/subscribe
Solution 2: Avoid unnecessary use of global variables
Solution 3: Recycling object reference
React Native debugging and performance monitoring tool
1. Performance analysis tool
2. Chrome's DevTools
3. React DevTools
4. Flipper
5. React Native Performance Monitor
Delete console log
Solution 1: Use _DEV_global variable
Use babel-plugin-transform-remove-console
Conclusion
Anyway, optimizing the performance of React Native applications is essential for a seamless user experience. By balancing animations, minimizing rerendering, optimizing images, and using stable npm packages, developers can improve application speed and responsiveness. Additionally, leveraging efficient debugging tools and deleting unnecessary console logs can further improve performance. Prioritizing these optimization techniques ensures optimal performance and excellent user satisfaction in today's competitive application market.
The above is the detailed content of Essential React Native Performance Tips and Tricks. For more information, please follow other related articles on the PHP Chinese website!

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