HTML Performance Optimization - Reducing Render-Blocking Resources in React App
I'm refactoring my project and I'm updating my dependencies and Building an application that heavily relies on third-party scripts, I've noticed performance issues impacting load times... While analyzing the rendering process, I discovered that some of these scripts are render-blocking, causing a delay in the First Contentful Paint (FCP). To tackle this, I decided to defer loading non-essential scripts and used the `async` attribute on some of them. However, I'm uncertain if this is the best practice for my React app. Here's a snippet of how I've included some of these scripts in my `index.html`: ```html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>My React App</title> <link rel="stylesheet" href="styles.css"> <script src="https://example.com/script.js" async></script> </head> <body> <div id="root"></div> <script src="bundle.js"></script> </body> </html> ``` I’ve also read about using `preload` and `prefetch` to optimize resource loading, but I'm not quite clear on how to implement these correctly for scripts in a React app. For example, should I preload critical scripts that are essential for rendering? Here's what I attempted: ```html <link rel="preload" href="https://example.com/script.js" as="script"> ``` In addition, I tried to bundle and minify my CSS and JS files using a tool like webpack, but load times still feel sluggish. Any recommendations on further optimizations? What strategies are effective for reducing render-blocking resources in modern React applications? Also, if anyone has insights on prioritizing critical CSS or using tools like Lighthouse for performance audits, that would be super helpful. Thanks in advance for your expertise! I'm open to any suggestions. Any examples would be super helpful.