Nextjs Link slow to fetch page and dynamic page

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19-09-2024

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When working with Next.js, a popular React framework, developers sometimes face issues with slow page fetching, particularly when dealing with dynamic pages. In this article, we will explore the causes of this problem, provide an improved version of a sample code snippet illustrating the issue, and offer actionable insights to optimize your Next.js application for better performance.

The Problem Scenario

Many Next.js developers have reported experiencing delays when navigating between dynamic pages using the <Link> component. This can be especially frustrating for users expecting a smooth and fast experience. Here’s an example of a problem scenario:

Original Code Example:

import Link from 'next/link';

const DynamicPage = ({ data }) => (
  <div>
    <h1>{data.title}</h1>
    <Link href="/dynamic/[id]" as={`/dynamic/${data.id}`}>
      <a>Go to Dynamic Page</a>
    </Link>
  </div>
);

export default DynamicPage;

In this code, we have a basic setup where the <Link> component points to a dynamic page based on an ID. While this implementation is correct, some users may experience latency when the component fetches data for the target page.

Why Is Link Slow to Fetch Pages?

The slow fetching of pages in Next.js can be attributed to several factors:

1. Data Fetching Strategies: If data fetching is done on the client-side for dynamic pages (using useEffect or similar hooks), it can lead to slower initial load times since the component has to wait for the data to be fetched after the page is rendered.

2. API Response Time: The speed of the API that the dynamic page depends on plays a significant role. If the API takes longer to respond, the user will experience a delay in loading the page.

3. Network Latency: Depending on the user's location, there may be latency issues when making network requests, affecting the performance of the link.

4. Large Payloads: If the data being fetched is large, it can slow down rendering times, especially on slower devices or networks.

Optimizing Dynamic Page Fetching

To optimize the fetching of dynamic pages in Next.js, consider implementing the following strategies:

1. Server-Side Rendering (SSR): Leverage Next.js’s built-in SSR capabilities. You can use getServerSideProps to fetch data server-side before the page is served to the client.

   Improved Code Example:

   import Link from 'next/link';
   
   const DynamicPage = ({ data }) => (
     <div>
       <h1>{data.title}</h1>
       <Link href="/dynamic/[id]" as={`/dynamic/${data.id}`}>
         <a>Go to Dynamic Page</a>
       </Link>
     </div>
   );
   
   export async function getServerSideProps(context) {
     const { id } = context.params;
     const res = await fetch(`https://api.example.com/data/${id}`);
     const data = await res.json();
   
     return { props: { data } };
   }
   
   export default DynamicPage;
   

2. Static Site Generation (SSG): If the data does not change frequently, consider using SSG with getStaticProps and getStaticPaths to pre-render the pages at build time.

3. Optimizing API Calls: Ensure your APIs are optimized for speed. Use techniques like caching, pagination, and optimizing database queries to reduce response times.

4. Lazy Loading: Implement lazy loading for images and other resources to improve the initial load time of the page.

Additional Resources

• Next.js Documentation: The official documentation provides comprehensive guides and examples for optimizing Next.js applications.
• Web Performance Optimization Techniques: Google’s resource for various performance optimization techniques.
• React Performance Optimization: Official React documentation on performance improvements.

Conclusion

Understanding and addressing slow page fetching in Next.js, particularly for dynamic pages, can significantly enhance user experience. By employing techniques like server-side rendering, optimizing API calls, and leveraging Next.js's features effectively, developers can create fast and efficient web applications.

Remember to continually monitor your application's performance and stay updated with Next.js improvements and best practices to keep your web app running smoothly.