React App Performance Optimization. Techniques to speed up your React App. DOM in React is a standard that defines how you get, update or manipulate HTML elements. The Virtual DOM is React’s a local copy of the HTML DOM.
Techniques to speed up your React App
In React, your UI is rendered by updating something called DOM (Document Object Model). In basic layman terms, DOM resembles a tree-like structure of objects and nodes.
In simpler terms, DOM in React is a standard that defines how you get, update or manipulate HTML elements.
The React DOM knows how to render a page but it is not so intelligent to keep track of each node and components which are updating.
So, let’s say you have a list of 10 items on your SPA (Single Page Application) and you have to update one of them when your user interacts with UI. With DOM, you will end up updating all the components as the entire list will get re-rendered.
That’s where the concept of Virtual DOM comes into play. The Virtual DOM is React’s a local copy of the HTML DOM.
Let’s go back to our list example and figure out how Virtual DOM will let React renders the UI.
When the user interacts with UI, React would create a copy in the form of Virtual DOM and updates the UI after comparing the real DOM with the virtual DOM. In this way, the item which needs to be updated will update without affecting other items.
In the above section, you read about the good parts of Virtual DOM.
Now, let’s be familiar with the bad parts of Virtual DOM which are single-handedly responsible for many performance issues in React.
React leverages a diff algorithm in order to minimize the operations to be done at nodes. However, the algorithm in its own sense is not perfect.
For instance, let’s take a look at the GIF given below which resembles a react DOM tree. Let’s say that the values of the nodes in yellow have changed, and need to be updated.
As you can see above, React goes on rendering the whole subtrees instead of rendering the relevant component. When these unnecessary renders are left idle in a React application, they can eat up unnecessary CPU and memory resources which can be fatal for your React application. This is why they are called Wasted Renders.
When it comes to Virtual-DOM, about half of performance-related issues in Reactjs are originated from:
Article covers: How native is react native?, React Native vs (Ionic, Cordova), Similarities and difference between React Native and Native App Development.
To make the most out of the benefits of offshore software development, you should understand the crucial factors that affect offshore development.
While outsourcing **[custom software development services](https://bytecipher.net/ "custom software development services")** for all your needs, you can add ample interests to the business by giving access to skilled expertise resulting in the...
Vinew Technologies focused majorly over ERP Software services and POS Software services, Web & Application development services & Woo commerce and Wordpress easy-to-use, multipurpose social media plugin for WordPress.