What to do if vue page switching is slow

When using Vue to develop a single page application (SPA), the speed of page switching is one of the key factors in user experience. If the page switching is too slow, the user will be unable to use the application smoothly, thus affecting the usability of the application and user satisfaction. So, if we encounter slow Vue page switching, we can take the following measures to optimize it.

1. Load routing components on demand

In Vue, vue-router is usually used to implement routing navigation between pages. When the application is initialized, vue-router will load all routing components into memory at once by default. If the application has too many routing components or some components are very large, it will cause the page loading time to be too long, thus affecting the page switching speed.

In order to solve this problem, we can use the on-demand loading (Lazy Loading) method, that is, when the user accesses a route, the component corresponding to the route is loaded into the memory. This can be achieved through Vue’s asynchronous components.

For example, in the routing configuration of vue-router, we can change the definition of the component to an asynchronous function, which returns a Promise object. When the Promise is resolved, the asynchronous component will be loaded and rendered. ：

const router = new VueRouter({
  routes: [
    {
      path: '/home',
      component: () => import('./Home.vue')
    },
    // ...
  ]
})

2. Delete unnecessary global CSS styles

After the page is loaded, the browser needs to apply CSS styles to all elements, which may occur during this process Render blocking. If some global CSS styles are not necessary, we can consider removing or streamlining them.

It should be noted that deleting global CSS styles may affect the performance of the page, so you need to operate with caution. If you're not sure which styles are unnecessary, you can use the Performance Analysis tool in Chrome Developer Tools to view the rendering timeline and identify which CSS styles are causing blocking.

3. Optimize image resources

Image resources are a large proportion of file types in web applications. Their size and loading speed will directly affect page performance. We can optimize image resources in the following ways:

• Compress images: Use professional image compression tools to compress images to appropriate sizes and reduce loading time.
• Use image CDN: Using image CDN (content delivery network) can improve image loading speed and reduce server load.
• Use picture formats: For different types of pictures, you can choose the most suitable picture format. For example, the PNG format is suitable for situations where the image has transparency and image quality needs to be guaranteed; the JPEG format is suitable for large images such as photos.

4. Use keep-alive to cache pages

In Vue, use the keep-alive component to cache loaded component instances to prevent each access Re-renders the page, thereby increasing page load speed. The keep-alive component can set the include and exclude fields to specify which components need to be cached or excluded from the cache.

<keep-alive :include="['Home', 'Profile']">
  <router-view />
</keep-alive>

It should be noted that when using the keep-alive component to cache pages, it may cause some side effects, such as occupying more memory and causing some state inconsistencies. Therefore, use requires careful consideration and careful testing.

5. Reduce running overhead

In Vue, each component has a life cycle, and different life cycles correspond to different operations. If the business logic in the component is too complex and the data needs to be recalculated and parsed every time it is rendered, it will have a great impact on page performance.

In order to reduce the running overhead when rendering the page, we can take the following methods:

• Reduce the amount of calculation: put some tasks with relatively large calculation amount in the created or Calculated during the mounted life cycle to avoid repeated calculations during rendering.
• Avoid unnecessary rendering: When a component is updated, decide whether to re-render the component by comparing the difference between the old and new data.
• Use Vuex appropriately: Using Vuex to manage the state of the application can reduce the cost of data communication between components and avoid unnecessary rerenders.

6. Other optimization strategies

In addition to the above methods, you can also try the following optimization strategies:

• Use Webpack or other build tools Optimize package size and speed.
• Use browser cache: Add appropriate caching mechanism and control cache time in the application to avoid repeated requests for static resources.
• Use server-side rendering (SSR): SSR can complete the initial rendering on the server side, improving page loading speed and SEO.
• Pay attention to memory leaks: In Vue applications, some event subscriptions, timers, etc. need to be manually cleaned up when the component is destroyed.

Summary

Page switching is crucial to the performance and user experience of Vue applications. If page switching is slow, it will greatly affect the user experience. When developing Vue applications, you need to pay attention to the following points:

• Load routing components on demand;
• Delete unnecessary global CSS styles;
• Optimize image resources;
• Use keep-alive to cache pages;
• Reduce running overhead;
• Other optimization strategies.

Through the above optimization strategies, we can effectively improve the Vue page switching speed, improve user satisfaction and application usability.

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