How does virtual DOM make ReactJS more performant?

Have you ever wondered why ReactJS is so popular among web developers and considered to be more performant? Well, the answer may be traced back to React’s unique virtual DOM implementation which provides numerous advantages than traditional methods. Virtual DOM gives the ability for ReactJS applications to dramatically improve its performance by optimizing the DOM updates, making the application more responsive.

The problem with traditional approaches to DOM manipulation is that they are very costly in terms of performance. Each element in the page needs to be rendered separately, and the process of updating the page can be very slow and inefficient. According to a study published in the ACM Digital Library, navigating and manipulating the DOM is a top performance issue for web apps, and can account for up to 80% of total execution time. Furthermore, research presented in the IBM developerWorks technical journal notes that DOM operations lead to inefficient processes and are responsible for a large portion of web page load delays.

Milton Jones specializes in developing robust web applications using ReactJS, and is an expert in understanding the unique features of virtual DOM. With his extensive experience, he has here explored how virtual DOM can be applied to make ReactJS more performant, and why it’s being widely adopted in the development of modern web applications.

In this article, you will learn how virtual DOM works, what benefits it offers in terms of performance optimization, and why it’s favored by ReactJS developers. A further discussion will cover the various techniques for implementation, and the potential impact this technology can have on the development of scalable web applications. Finally, the article will provide a comprehensive guide to best practices and tools to use for delivering ReactJS applications with virtual DOM.

Definitions of Virtual DOM and ReactJS:

Virtual DOM is an offscreen representation of the original Document Object Model (DOM) tree, used by certain frameworks like ReactJS for the purpose of managing changes made to the UI faster and more efficiently. Essentially, it allows for a much smoother experience when it comes to UI updates, without having to completely rebuild the entire DOM. The benefits of this are that it means much faster loading of applications, and less processor and memory usage when it comes to carrying out certain tasks.

ReactJS is a JavaScript library which is designed to allow developers to create user interfaces using a simple and intuitive syntax. It carries out the necessary tasks to allow for the creation of interactive applications that run within the browser, as opposed to those which are rendered on the server side. It is one of the most popular frameworks out there for front end development, and is highly acclaimed for its efficient performance and scalability.

By using the virtual DOM in conjunction with ReactJS, developers are able to make sure that their applications are much faster and more responsive overall. This is because when any changes are made to the UI, the virtual DOM is able to quickly analyse the differences between the original DOM and the new state, and only the vital changes are actually implemented. This helps to reduce processor and memory usage, and makes sure that any new UI elements are as responsive as possible.

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In conclusion, the virtual DOM and ReactJS work hand-in-hand to ensure that any user interfaces are as efficient and responsive as possible. By using the virtual DOM to analyse the differences between the original DOM and the new state, ReactJS is able to quickly make the necessary changes to the UI without having to completely rebuild it from scratch. This results in much faster load times, and less processor and memory usage, helping to ensure that any user interfaces are as performant as possible.

1. What is the Virtual DOM

The Virtual DOM is an important part of the React.js library and a key factor in React’s performance. It is a JavaScript representation of the actual DOM (Document Object Model). While the real DOM is directly linked to the view of the page, the Virtual DOM is a representation of the entire UI, including components, data, and state. It may contain hundreds of objects and thousands of lines of code – all organized into an abstract layer generated by React.

What Does the Virtual DOM Do?

The Virtual DOM is a tool used by React to improve performance and help keep complex JavaScript components running efficiently and quickly. It makes it much easier and faster to manage the UI state in React apps as opposed to traditional methods. It does this by re-rendering a JavaScript object rather than manipulating the actual DOM. In doing this, React can compare the object pre-update and post-update to determine which changes need to be applied to the real DOM.

How Does the Virtual DOM Help Performance?

By taking the responsibility of updating the real DOM out of the hands of the developer and instead managing it through the Virtual DOM, React can swiftly and accurately evaluate differences between the two documents in order to determine which changes need to be made to the real DOM. This greatly reduces the amount of time and effort used to make changes to the UI.

With this reduction in time and effort comes a huge performance boost. As a result of this efficient system, React apps can run much faster and smoother than apps built with other frameworks, enabling developers to create highly interactive user interfaces.

The performance boost is especially useful when dealing with large amounts of data. React can easily identify when new data is added or old data is removed and update the UI with minimal effort. This makes React ideal for large applications with high user loads.

Benefits of Virtual DOM

  • Efficient updates of the real DOM
  • Reduced time and effort required to manage the UI
  • Greatly improved performance of React apps
  • Easy handling of large user loads and data sets
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2. How does the Virtual DOM Enhance ReactJS Performance

“Programs must be written for people to read, and only incidentally for machines to execute.” – Abelson & Sussman

ReactJS is a popular web development framework. Its success is aided by a feature know as the Virtual DOM, which provides significant performance improvements. The Virtual DOM is a feature of ReactJS that provides a number of practical advantages that enhance ReactJS performance. In this article we shall explore what makes the Virtual DOM so efficient and powerful.

What is the Virtual DOM?

The Virtual DOM is a reactive and lightweight JavaScript library that makes web performance faster and easier to manage. It is a representation of the real DOM tree, which is used for efficiently making changes and updating the user interface. This library manipulates DOM elements directly and does not need to re-render entire DOM elements, which reduces the time it takes to update the UI.

Benefits of the Virtual DOM

Firstly, it drastically reduces the need for DOM manipulation and greatly simplifies maintenance work. The Virtual DOM is also incredibly fast, as it only has to update the parts of the DOM tree that have changed. This means the browser no longer needs to render the entire page when changes are made to the UI. Consequently updating the web page takes significantly less time.

Also, the Virtual DOM makes ReactJS more reliable and less prone to errors, as it provides a stable environment for making modifications. This increases the product’s reliability and also improves its performance.

Finally, the Virtual DOM is highly customizable and allows developers to make more complex changes without having to write complex code. This increases ReactJS’s flexibility and allows developers to create more interactive and efficient web applications. With the ability to make more robust changes, developers can create better user experiences for their web applications.

Overall, the Virtual DOM makes ReactJS an attractive option for web developers. Its capabilities makes web development more efficient, so developers can create better and faster web applications without having to write complex code. With the Virtual DOM, ReactJS is more flexible, reliable and performant, giving developers the ability to create superior web applications in less time.

3. Benefits of using the Virtual DOM in ReactJS

“Programs must be written for people to read, and only incidentally for machines to execute.” – Hal Abelson

The virtual DOM (VDOM) is the integral part of ReactJS which allows to efficiently update the user interface. Virtual DOM enables ReactJS to increase its performance in applications by using an efficient tree reconciliation algorithm which keeps track of changes and decides which parts of the DOM tree must be updated. This makes ReactJS faster and more efficient compared other frameworks.

Benefits of using the Virtual DOM

Using the Virtual DOM (VDOM) in ReactJS has many advantages and lets developers not worry about the performance of their applications. All of the DOM manipulation and changes are handled by ReactJS. Here are some of the benefits of using the Virtual DOM:

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Firstly, the changes to the UI is are stored in the object structure known as VDOM, which is a copy of the real DOM. This is then used to compare the changes with the existing DOM and allows only those changes which are needed to be implemented on the actual DOM.

Secondly, JavaScript was generally slow when used in manipulation of the DOM. The Virtual DOM allows for faster updates to the DOM, regardless of the changes made as any changes made to the virtual DOM are always faster than those made to the real DOM.

Lifecycle methods in ReactJS and VDOM

The Virtual DOM implementation also offers Lifecycle methods which are used for the response to actions by the applications. The following are some of the lifecycle methods:

ComponentWillMount() – this is the initial method for the DOM, which sets up the initial render for the DOM on the application.

ComponentDidMount() – this is called after the the initial rendering.

ShouldComponentUpdate() – this method checks the DOM if there is a need to update it.

ComponentWillUpdate() – this method triggers when there is a need to update the DOM.

ComponentDidUpdate() – this method signals when the DOM is done being updated.

By using VDOM, it makes ReactJS more efficient. The VDOM keeps track of the DOM changes and only updates the part of the DOM tree which is necessary. This increases the performance of ReactJS and makes the development process easier for the developers.


Creating fast and efficient webpages has become increasingly important for web developers as high site speed is now a big SEO ranking factor. ReactJS is one of the most popular libraries out there to help developers accomplish this, and a big part of its functionality centers around its virtual DOM feature. But how does it make ReactJS so performant?

In order to answer this question, it’s important to understand that virtual DOM is a copy of the original DOM which ReactJS stores internally. Anytime the original DOM is revised by the user or a programmatic change happens, ReactJS compares the virtual DOM to the real one in order to find which elements need to be changed. This comparison is done in the form of a diff and ReactJS only updates the specific elements that need to be modified, instead of having to update the entire document. This strategy is much more effective than traditional methods, which require a lot more resources and time.

If you’re interested in learning more about how the virtual DOM makes ReactJS so performant, be sure to check out the blog for more detailed explanations. Keep an eye out for new releases as well, as the ReactJS team is constantly working to improve the library’s performance even further.

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