The Future of React Apps: Exploring React Server Components for Faster Server-Side Rendering



May 11, 2023


May 11, 2023

React has been a popular choice for building dynamic and interactive web applications. But what about server-side rendering issues? React Server Components, or RSCs, aim to solve this problem by bringing faster server-side rendering to React apps.

In this blog, we will explore the server-side rendering issue and the role of RSCs in solving those issues. We will also delve into the different rendering mechanisms of RSCs and how to implement RSC in your React app.

Additionally, we will discuss the constraints and limitations of using RSCs. Lastly, we will provide some best practices for using RSCs to ensure the optimal performance of your React app. So, let's dive in and explore the future of React apps with RSCs!

What is Server-Side Rendering?

Website performance and search engine optimization (SEO) are crucial factors for online success. However, traditional client-side rendering can result in slower load times, which negatively impact both user experience and search engine rankings. 

This is where server-side rendering (SSR) comes into play, improving website speed and SEO. With SSR, the server renders the web page before sending it to the client's browser, reducing the amount of client-side processing. 

However, the main issue with server-side rendering in React is that it can result in poor performance and slow page load times. This is because server-side rendering requires the entire page to be rendered on the server before it can be sent to the client, which can take a significant amount of time for a complex React app.

How to solve the server-side rendering issue that results in poor app performance?

One way to solve this issue is by using React Server Components. It is a new feature in React that allows the server to send only the necessary components to the client, rather than the entire page. This can greatly improve performance and reduce page load times for large and complex React applications.

By using React Server Components, developers can take advantage of the benefits of server-side rendering while minimizing its downsides. This results in faster, more efficient, and more responsive applications that can provide a better user experience.

What are React Server Components (RSCs)?

React Server Components is a new feature in React that enables developers to build server-rendered applications that are more efficient, scalable, and maintainable.

React Server Components work by allowing the server to send only the necessary components to the client, rather than sending the entire page. This helps to minimize the amount of data that needs to be transferred between the server and the client, reducing latency and improving performance.

React Server Components can also help to simplify the development process by allowing developers to focus on building reusable components that can be easily shared between different parts of an application. This can help to improve code quality and maintainability while reducing development time and costs.

Overall, by providing improved performance and reducing the need for unnecessary client-side code, they have the potential to revolutionize how we build web applications.

How do React Server Components Work for Faster Server-side Rendering?

1. Eliminates the need for client-side JavaScript

RSCs enable developers to create dynamic and interactive server-rendered apps, allowing for faster rendering and better performance by eliminating the need for client-side JavaScript. 

2. Build Reusable components on the server

By building reusable components on the server, RSCs offer greater flexibility in building large-scale applications with easier code maintenance and debugging, separating concerns between the server and the client. 

This new feature is likely to revolutionize how React apps are developed, as developers seek ways to improve app performance and user experience.

Benefits of Using React Server Components

React Server Components (RSC) offer numerous benefits to developers and businesses alike.

1. Improved app performance

One of the primary advantages of using RSC is improved app performance, which can result in faster load times and better user experiences. 

2. Simplify the codebase

A simplified codebase makes it easier for developers to manage their applications. This can lead to better scalability, allowing apps to handle large volumes of traffic more effectively.

3. Enhanced developer experience

By separating concerns between the server and client, RSCs make it easier for developers to debug and test their apps. This can reduce development time and result in a better overall development experience. 

Finally, adopting new technologies like RSCs can help businesses future-proof their apps, ensuring they stay ahead of the competition in an ever-changing technological landscape.

Rendering Mechanism for React Server Components

In terms of rendering, React server components can be either static, streaming, or suspenseful.

1. Static Rendering:

It does not require any data fetching or processing and can be rendered immediately on the server. Static rendering involves rendering the entire component tree on the server and sending it to the client as a static HTML page. This is useful for pages that don't require any interactivity, and where the content can be pre-rendered.

2. Streaming Rendering

Streaming involves sending partial HTML responses to the client as the server renders the component tree. This allows the client to start rendering the page before the full HTML response is received, resulting in faster-perceived loading times.

3. Suspenseful Rendering.

Suspenseful rendering is a new feature in React that allows components to pause rendering and show a fallback UI while they load their data. This is useful for components that need to fetch data from an API before they can render and allows the user to see some content while the rest of the page is being loaded.

React server components can be rendered on the client-side, or server-side, or shared between the client and server. Client-side rendering involves rendering the components on the browser using JavaScript. Server-side rendering involves rendering the components on the server using Node.js and sending the fully rendered HTML page to the client. Shared rendering involves using the same codebase for both client and server-side rendering.

Overall, the rendering mechanism in React with server components offers developers greater flexibility and control over how their components are rendered and updated. 

Implementing React Server Components in JavaScript React App

Implementing React Server Components can bring significant benefits to the development process of React applications. By rendering components on the server-side, initial load times can be greatly reduced, leading to a better user experience.

This approach can also improve SEO by allowing search engines to crawl and index content more easily. Moreover, it offers new possibilities for dynamic content and personalized experiences on the server side.

So here is the simple implementation:

In this example, we define a simple React Server Component called “MyServerComponent” that accepts a “name” prop and displays a greeting. We then create a server component factory using “createServerComponent” from the “react-server-dom-webpack” library. Finally, we render the server component to a string using the factory's “renderToString” method and output the resulting HTML to the console.

This is just a basic example, and there are many more advanced features and configurations available when working with React Server Components. However, this should give you a good starting point for working with this new feature in React.

Constraints and Limitations

While React Server Components offer numerous benefits, developers need to be aware of the constraints and limitations associated with this technology. As React Server Components are still in the experimental phase, they may not be suitable for all use cases.

Additionally, developers who are not familiar with server-side rendering may require additional training to effectively work with this technology. Compatibility with existing libraries and frameworks may also be limited, which could pose a challenge for organizations that have already invested in specific tools or technologies. 

However, as React Server Components continue to evolve, many of these constraints will likely be addressed over time.

Difference Between React Server Components and Server Side Rendering (RSC vs SSR)

React Server Components (RSC) and Server Side Rendering (SSR) are two technologies that can improve website performance, here are the key differences between RSC and SSR.

React Server Components Server Side Rendering (SSR)
Introduced in React 18. Introduced earlier in React.
Improves performance and reduces server load by allowing components to be rendered on the server and cached for reuse. Renders the entire application on the server before sending it to the client.
Uses streaming to send components in chunks as they are ready, enabling faster load times for large applications. Sends a complete HTML page to the client, which may take longer to load.
Uses a declarative syntax for defining components and their behavior, making it easier to maintain and modify code. Requires more setup and configuration to implement than RSC.
Can be used to render both static and dynamic content. Generally used for static content, but can also be used for dynamic content.
Requires React 18 or higher to use. Can be used with earlier versions of React.

Note: RSC is still an experimental feature and may be subject to change in future versions of React.

The key benefit of using RSC is that it allows for more efficient server-side rendering of React applications. By enabling developers to render individual components on the server side, RSC can lead to faster initial load times and improved SEO.

It also offers greater flexibility for developers when it comes to dynamic content and user personalization on the server side. 

Best Practices for Using React Server Components

Here are some best practices for using React Server Components:

1. Use React Server Components when necessary:

 React Server Components can be a powerful tool for improving server-side rendering performance, but they are not always necessary. Only use them when there is a clear benefit to using them, such as when rendering large or complex components.

2. Use streaming when possible: 

Streaming allows the server to send the content to the client as it is rendered, which can improve the overall performance of the application. Use streaming whenever possible to minimize the time to the first byte and improve perceived performance.

3. Keep components small and focused: 

React Server Components work best when they are small and focused on a specific task. Break up large components into smaller, more manageable pieces to make them easier to work with and maintain.

4. Optimize for server-side rendering: 

When developing React Server Components, keep in mind that they will be rendered on the server. Optimize your code for server-side rendering by avoiding any code that is specific to the client.

5. Avoid using client-side APIs: 

React Server Components are meant to be rendered on the server, so avoid using any client-side APIs that may not be available on the server.

6. Test thoroughly: 

Like any other component, React Server Components should be thoroughly tested to ensure that they work as expected. Test for both client-side and server-side rendering to ensure that your components work in all environments.

By following these best practices, you can ensure that your React Server Components are optimized for performance and maintainability.


React Server Components are the future of server-side rendering. They enable developers to build faster and more efficient web applications that can handle a large number of users and requests. 

With React Server Components, you can easily create reusable components that can be shared between the server and client sides, saving development time and improving performance. While there are some limitations to the technology, it's exciting to see how it will shape the future of web development. 

Well, if you are building a React project try using DhiWise React Builder to accelerate your app development. Visit our website and start exploring this cutting-edge technology today!