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ixc2024:tech:wfrontend:criteria:react [2024/05/22 14:59] – [Performance Optimisation] alestaixc2024:tech:wfrontend:criteria:react [2024/05/22 15:50] (current) – rubenhuygens
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 One of the key aspects of sustainability in web development is minimising resource consumption. In React apps, developers can implement various techniques to reduce the application’s overall footprint: One of the key aspects of sustainability in web development is minimising resource consumption. In React apps, developers can implement various techniques to reduce the application’s overall footprint:
  
-   * Code Minification and Compression: By minifying and compressing JavaScript and CSS files, developers can significantly reduce their size, resulting in faster loading times and reduced bandwidth consumption. +   * Virtual DOM and Efficient Rendering: React’s virtual DOM efficiently updates and renders only the necessary components, reducing unnecessary re-renders and enhancing performance. 
-   * Lazy Loading: Implementing lazy loading techniques allows components, images, and other assets to be loaded only when they are required. This approach minimizes initial loading times and conserves bandwidth.+ 
 +  * Lazy Loading: Implementing lazy loading techniques allows components, images, and other assets to be loaded only when they are required. This approach minimizes initial loading times and conserves bandwidth.
  
    import React, { Suspense, lazy } from 'react';    import React, { Suspense, lazy } from 'react';
    const LazyComponent = lazy(() => import('./LazyComponent'));    const LazyComponent = lazy(() => import('./LazyComponent'));
  
-   * Tree Shaking: Utilising tools like Webpack, developers can eliminate unused code from the final bundle. This process reduces the application’s size, making it more resource-efficient.+  * Code Minification and Compression: By minifying and compressing JavaScript and CSS files, developers can significantly reduce their size, resulting in faster loading times and reduced bandwidth consumption.
  
-==== Performance Optimisation ====+         React.memo, useMemo, useCallback
  
-Improving performance not only enhances the user experience but also contributes to sustainability by reducing energy consumption. React provides several optimisation techniques that help improve application performance: 
- 
-   * Virtual DOM and Efficient Rendering: React’s virtual DOM efficiently updates and renders only the necessary components, reducing unnecessary re-renders and enhancing performance. 
- 
-    React.memo, useMemo, and useCallback 
- 
-   * Memoization and PureComponent: By memoizing expensive computations and utilising pure components, developers can prevent unnecessary calculations and re-rendering of components, leading to improved performance. 
 ==== Accessibility and User Experience ==== ==== Accessibility and User Experience ====
  
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    (useSWR or React Query)    (useSWR or React Query)
  
-  * Efficient Network Requests: Minimising the number of network requests and optimising data transfer can significantly reduce the energy required to load a React app. Techniques like batched requests, data compression, and utilising efficient protocols like HTTP/2 or HTTP/3 can contribute to energy efficiency.+  * Efficient Network Requests: Minimising the number of network requests and optimising data transfer can significantly reduce the energy required to load a React app. Batching requests through axios. 
 + 
 +   import axios from 'axios'; 
 +    
 +   async function fetchData() { 
 +  const [response1, response2] = await Promise.all([ 
 +    axios.get('/api/data1'), 
 +    axios.get('/api/data2') 
 +  ]); 
   * Background Processes and Timers: Avoiding unnecessary background processes and minimising the usage of timers can reduce energy consumption on both client and server sides. By optimising the timing and frequency of such operations, React apps can be more sustainable.   * Background Processes and Timers: Avoiding unnecessary background processes and minimising the usage of timers can reduce energy consumption on both client and server sides. By optimising the timing and frequency of such operations, React apps can be more sustainable.
  
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 Apart from technical optimisations, sustainable web development also emphasises the importance of thoughtful design and user experience choices. React apps can incorporate sustainability principles into their design: Apart from technical optimisations, sustainable web development also emphasises the importance of thoughtful design and user experience choices. React apps can incorporate sustainability principles into their design:
  
-   * Minimalism and Simplified UI: Implementing a clean and minimalist user interface not only enhances user experience but also reduces cognitive load and resource requirements. Streamlined designs with fewer elements contribute to a more sustainable user experience. 
-   * Optimal Image Usage: Images often account for a significant portion of a web page’s size and loading time. By utilising efficient image formats (e.g., WebP) and implementing techniques like lazy loading and responsive images, React apps can reduce bandwidth consumption and improve performance. 
    * Dark Mode: Introducing a dark mode option in React apps can provide users with an energy-saving alternative. Dark mode reduces the energy consumption of devices with OLED or AMOLED displays, as fewer pixels need to be lit up.    * Dark Mode: Introducing a dark mode option in React apps can provide users with an energy-saving alternative. Dark mode reduces the energy consumption of devices with OLED or AMOLED displays, as fewer pixels need to be lit up.
 +
 +
 +   const [theme, setTheme] = React.useState('light');
 +
 +   const toggleTheme = () => {
 +     setTheme(theme === 'light' ? 'dark' : 'light');
 +   };
  
 Reference: [[https://medium.com/@darpanrangari/embracing-sustainability-in-web-development-building-greener-react-apps-aa39a838174c|link]] Reference: [[https://medium.com/@darpanrangari/embracing-sustainability-in-web-development-building-greener-react-apps-aa39a838174c|link]]