Discuss how to solve the problem of slow first screen of Vue.js in multi-page applications

Vue.js is a popular front-end JavaScript framework that makes it easier to manage and render pages from a front-end developer's perspective. However, when building a multi-page application with Vue.js, you may encounter a significant problem: slow loading of the first screen. This article will explore how to solve the problem of slow Vue.js first screen in multi-page applications.

Cause of the problem

In a multi-page application, each page may load an independent Vue.js instance. In this case, the JavaScript code in the page is downloaded and executed, which is usually the part of the page that takes the longest to load.

The Vue.js framework needs to generate a large number of virtual DOM objects when rendering the first screen, and these objects are passed between data binding and components. These operations consume significant CPU and memory resources, resulting in delayed page load times.

In addition, Vue.js also needs to load its dependent libraries and components from the outside through HTTP requests, which will also affect the first screen loading speed.

Solution

SSR (Server Rendering)

Server rendering (SSR) is one of the effective solutions to solve the slow first screen of Vue.js. SSR renders the content the user needs faster by pre-generating HTML markup on the server side, without waiting for a JS script to run in the browser.

In the Vue.js core library, there is a toolkit called vue-server-renderer that can render on the server. Using it, a Vue.js application can be packaged into a server-side usable JavaScript script and executed on the server side to render the above-the-fold screen.

The disadvantage of SSR is that it requires more server resources and requires more complex configuration, but it usually significantly improves the first screen loading speed.

Code Splitting

Code Splitting is a method of improving performance by splitting JavaScript code into multiple smaller chunks, loading only the required chunks of code when the page requires it. First screen loading speed technology.

In Vue.js, this can be achieved using Webpack or other build tools that support code splitting. After the application is built, Vue.js packages the application into multiple chunks and then loads the required chunks into the browser in a lazy-loading manner.

This means that when the user browses the page, only the necessary code blocks will be downloaded, thus improving the loading speed of the application.

Loading Skeleton(Loading Skeleton)

Loading Skeleton is a technique that displays a placeholder page during the loading phase. These placeholders have the same look and feel as the actual page, but contain only static text and images and no interactions or data.

In Vue.js, you can use the Skeleton Screen component or Shimmer effect technology to load the skeleton. These technologies help users get feedback as early as possible when the page is loading, thereby enhancing the user experience.

Pre-fetching (preloading)

Prefetching is a technology that obtains the data and resources that the page may need in the future before the user needs to access it. In Vue.js, prefetching can be implemented using asynchronous component technology.

Asynchronous component technology uses promises to load components asynchronously when rendering components. This means that this component can be loaded in advance and cached before the user visits the page that requires it.

Preloading can significantly reduce application load time and improve user response time.

Summary

In multi-page applications, Vue.js may cause the first screen to load slowly. The above solutions include techniques such as server rendering, code splitting, loading skeletons, and preloading, the suitability of which varies depending on the application scenario. Choosing the right solution can significantly improve your application's performance and user experience.

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