performance optimization

How to Analyze Next.js App Bundles

In this blog post, we will learn how to analyze the code bundles generated in a Next.js app. Next.js provides us with a useful way to analyze these bundles, allowing us to understand what’s inside them and optimize our application’s performance. To get started, open the package.json file of your Next.js app and add the following three commands to the scripts section: "analyze": "cross-env ANALYZE=true next build", "analyze:server": "cross-env BUNDLE_ANALYZE=server next build", "analyze:browser": "cross-env BUNDLE_ANALYZE=browser next build" Your updated package....

How to Implement Lazy Loading for Images in Hugo

When I recently launched the new home for my ebooks on The Valley of Code, I realized that the large number of images was impacting the loading time and increasing my hosting bill. Each page was quite long, with some even reaching 10MB in size. To mitigate this issue, I decided to implement lazy loading for the images, meaning that the browser would only load the image when the user scrolled to that particular section....

How to Use the useCallback React Hook

The useCallback React hook is a powerful tool that can help optimize your React applications. In this blog post, we’ll explore what the useCallback hook is useful for and how to work with it effectively. First, let’s briefly review the basics of React hooks. If you’re new to hooks, I recommend checking out my previous blog post on React hooks introduction. What is the useCallback Hook? The useCallback hook is used to memoize a function so that it is not recreated on every render of a component....

Lazy Loading Modules in Next.js: Optimize Your Application for Performance

Lazy loading modules in your Next.js app is a great way to optimize your application and improve performance. One module that we often need to load in specific parts of our app is the Moment library for handling date and time. In this article, we will explore how to lazy load the Moment library in Next.js and improve the performance of your app. To begin, let’s install the Moment library by running the following command in your terminal:...

The Importance of Immutability in React: Explained

In the world of React, immutability is a significant concept that plays a crucial role in the development process. Whether you agree with it or not, React and its ecosystem strongly encourage the use of immutability. It is essential to understand why immutability is so important and the implications it has. In programming, immutability refers to a variable whose value cannot be changed once it is created. You might not realize it, but you are already using immutable variables when working with strings....

The Next.js App Bundles

In a Next.js app, the code is divided into different bundles to enhance performance. These bundles are loaded as JavaScript files when you view the page source of the app. To break down the code and make it more understandable, let’s use an HTML formatter: <!DOCTYPE html> <html> <head> <meta charSet="utf-8" /> <meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1" /> <meta name="next-head-count" content="2" /> <link rel="preload" href="/_next/static/development/pages/index.js?ts=1572863116051" as="script" /> <link rel="preload" href="/_next/static/development/pages/_app.js?ts=1572863116051" as="script" /> <link rel="preload" href="/_next/static/runtime/webpack....