The key to optimizing the loading speed of Vue's first screen is to reduce JavaScript size, reasonably subcontract, and delay loading of non-critical resources. 1. Use lazy loading to load the components dynamically by () => import('path'), implementing code segmentation, allowing users to access only the code required to load the homepage for the first time; 2. Enable Production mode and compress the output, remove debugging information, and use Gzip or Brotli to compress and reduce the file size; 3. Remove unnecessary polyfills and use Tree-shaking to exclude unused library code; 4. The images are in WebP format and are compressed appropriately; 5. Preload key resources with <link rel="preload"> to improve browser loading efficiency; 6. Asynchronously load non-critical resources, such as delaying loading of the content below by listening to scroll events, thereby saving bandwidth and memory. These methods can significantly improve the loading speed and user experience on the first screen.

The Vue app's first-screen loading speed directly affects user experience and SEO performance. Optimize the initial loading time to make your application look faster and smoother. The key points are to reduce JavaScript size, subcontract reasonably, and delay loading of non-critical resources.

Lazy Load Routes

Vue Router supports dynamic import of components, so that each routing module can be loaded when needed, rather than packaged into main.js.

The specific approach is to change the original synchronization introduction to () => import('路徑') . For example:

 const Home = () => import('../views/Home.vue')

After doing this, the build tool will automatically split the code and generate multiple chunk files. When the user first visits, he only needs to load the code required for the homepage, and click on other pages before loading.

The advantages are obvious:

• The initial load script is smaller
• User perception faster
• Does not affect the development structure

But be careful not to over-split, otherwise it may cause too many requests to slow down the overall speed.

Enable Production mode and compress output

In development mode, Vue will contain a lot of debugging information and warnings, but in production environment, you must ensure that you are using the production build version. Vue CLI has handled this by default, but if you configure Webpack or Vite yourself, you need to check whether the correct environment variables are set (such as NODE_ENV=production ).

Additionally, enabling Gzip or Brotli compression at build time can also significantly reduce file size. For example, when using webpack, you can use compression-webpack-plugin to output the .gz file, and then enable the corresponding support on the server.

It is recommended to do the following things at the same time:

• Remove unnecessary polyfills (for example, if IE11 is not supported)
• Use Tree-shaking to exclude unused library code
• Images are in WebP format and are compressed appropriately

Preload critical resources asynchronously load non-critical parts

When a browser parses HTML, if it can know in advance what key resources to load, it can arrange the loading order more efficiently. You can use <link rel="preload"> to tell the browser that certain fonts, CSS or JS are to be used immediately.

For example:

 <link rel="preload" as="script" href="/main.js">
<link rel="preload" as="font" href="/fonts.woff2" type="font/woff2" crossorigin>

For some components or data that are not needed immediately, you can delay loading by setTimeout or listening for scroll events. For example, the content at the bottom of the homepage can be loaded until the user scrolls to that area.

This "load on demand" strategy not only improves the first loading experience, but also saves bandwidth and memory footprint.

Basically these are the methods. Optimizing Vue's first-screen loading is actually not complicated, but the details are easy to ignore, especially the two points of lazy routing and resource preloading. The effect is very obvious if done well.

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