Vue.js performance optimization you don’t know

Vue.js is a popular JavaScript framework that is one of the preferred frameworks for modern web application development. It is simple and easy to use, with features such as responsive data binding, componentization and virtual DOM. However, when using Vue.js, if performance optimization is not performed, its rendering and response speed may be reduced, affecting the user experience.

In this article, we will delve into Vue.js performance optimization tips and explore how to use best practices in Vue.js applications to improve performance and bring a better experience to users. .

1. Use the latest version of Vue.js

The development team of Vue.js has been working on improving the performance and stability of the framework. Each new version contains more optimizations and improvements. Therefore, keeping Vue.js up to date is very important to optimize the performance of your application. When using Vue.js, developers should use the latest version of the framework whenever possible.

2. Reasonable use of v-if and v-show

Vue.js provides v-if and v-show instructions, both of which can decide whether to display components or element. When using these two instructions, developers need to pay attention to the following aspects:

1. If a component does not need to be displayed during initial rendering, use the v-if instruction instead of the v-show instruction. Because the v-if directive will perform conditional judgment during initial loading, the component will only be displayed when the condition is true.
2. If a component needs to be switched frequently, use the v-show directive instead of the v-if directive. Because the v-show directive only sets the component's CSS style to "display:none", this makes switching faster.

3. Use the keep-alive cache component

The keep-alive component of Vue.js can cache components that have been created so that they can be quickly reused. Especially in dynamic components, using keep-alive components can significantly improve rendering speed.

For example, in an application with multiple tabs, each tab has a corresponding component. During the process of switching tabs, each component must be re-rendered, which may cause performance degradation. However, if you put these components in a tag, when you switch back, these components will no longer re-render, but will be loaded directly from the cache.

4. Avoid unnecessary calculated properties

In Vue.js, a calculated property is a property that is dynamically calculated based on data. The results of computed properties are cached and recalculated only when the data changes. Therefore, if a computed property is computationally intensive, it can cause performance issues.

To avoid this situation, you can change the calculated property to use the methods option, or use a getter method. This will cause the property to be recalculated on every re-render, but doing so ensures that the value calculated is the latest each time, rather than using the cached old value. If we need to cache calculation results, we can use the Vuex state manager.

5. Paging or virtual scrolling of long list data

Vue.js may have performance issues when processing large amounts of data. This is because Vue.js re-renders the entire list on every update. When the amount of data is large, such operations can be very time-consuming. To avoid this, we can use virtual scrolling or paging techniques. These technologies can divide data into multiple small pages or virtual scroll blocks and render them when needed, making page rendering faster.

6. Use asynchronous components

Asynchronous components are a technology that dynamically loads components. It can load components only when needed, instead of loading all components at once during initial rendering. Doing so can significantly improve initialization time and ensure application performance.

7. Use routing for lazy loading

When we use Vue.js routing, we can use routing for lazy loading, so that page components can be loaded only when needed. This helps reduce initial load time and improve performance.

8. Using Vue.js life cycle hooks

Vue.js provides many life cycle hook functions, which can help us optimize performance during the component's life cycle. For example, we can use beforeCreate and created hooks to initialize component data, use mounted hooks to load initial data, use beforeDestroy and destroyed hooks to release resources, and so on.

9. Lazy loading of asynchronous components and routing using Vue.js, lazy loading of third-party libraries and plug-ins

In Vue.js applications, we usually need to include third-party libraries and plug-ins . However, these libraries and plug-ins tend to increase the initial load time and file size of the application, thus affecting the performance of the application.

To avoid this problem, we can use Vue.js's asynchronous component and routing lazy loading technology to lazily load these libraries and plug-ins, loading them only when needed.

Summary

In this article, we discussed the importance of Vue.js performance optimization and introduced some available techniques and best practices, including using the latest version of Vue.js, Reasonable use of v-if and v-show instructions, use of keep-alive components to cache components, avoid unnecessary calculated attributes, paging or virtual scrolling of long list data, use asynchronous components, etc. If developers follow these best practices when developing Vue.js applications, they can improve their performance and stability and provide users with a better experience.

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