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Last updated on 2024年5月23日

How do you prioritize which resources to load first for faster web page performance?

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In the fast-paced world of web development, optimizing page load time is critical for user satisfaction and SEO rankings. As you build and maintain websites, understanding how to prioritize resource loading can greatly impact performance. This involves determining which files and elements are critical for initial rendering and interactivity, and which can wait. Techniques like critical rendering path optimization and lazy loading are key to achieving an efficient load sequence.

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Gurjit Singh

Frontend Developer @Maropost
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LinkedIn Top Voice | Tech enthusiast | 1 Million+ views on LinkedIn
Yash J.

Senior Full Stack Developer at Siemens | Angular | Nodejs | AWS

1 Critical Paths

The Critical Rendering Path (CRP) is the sequence in which a browser processes HTML, CSS, and JavaScript to convert code into a visual web page. To speed up your site, identify and prioritize the resources needed for the CRP. Inline critical CSS directly within the HTML to avoid render-blocking, and defer non-critical JavaScript until after the page has loaded. By focusing on just what's necessary for the initial view, you ensure users can start interacting with your page as quickly as possible.

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Gurjit Singh

Frontend Developer @Maropost
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Prioritizing resource loading is essential for optimizing web page performance. Focus on critical resources like CSS, JavaScript, and above-the-fold images for swift initial rendering. Inline critical CSS to eliminate render-blocking issues, and load non-critical JavaScript asynchronously to prevent blocking page rendering. Implement lazy loading for below-the-fold images to reduce the initial load time. Optimize image loading and use resource preloading to reduce latency. Utilize CDNs and caching to distribute resources efficiently. These strategies prioritize critical content loading, minimize render-blocking elements, and enhance performance.

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?????????? ????????????

LinkedIn Top Voice | Tech enthusiast | 1 Million+ views on LinkedIn
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1. **Critical Rendering Path**: Identify resources needed for initial page load. 2. **Async and Defer**: Use these attributes to control JS loading. 3. **CSS**: Load critical CSS inline and defer non-critical CSS. 4. **Lazy Loading**: Implement this for images and other media. 5. **HTTP/2**: Use it for multiplexing and prioritizing resources. 6. **Preloading**: Use `<link rel="preload">` for important resources. 7. **Compression**: Compress text-based assets to reduce their size. 8. **Caching**: Cache static resources for faster subsequent loads.

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Aswad Hassan

Co-Founder & CEO at BYTESOL
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Firstly, focus on critical render path items, like CSS and JavaScript for above-the-fold content. Inline critical CSS and defer non-critical CSS to load after the initial rendering. Then, prioritize asynchronous loading for JavaScript to prevent render-blocking. Load images efficiently, starting with smaller, optimized images and lazy loading others as needed, especially those within the viewport. Prioritize font files, ensuring essential fonts are loaded early to avoid text rendering delays. Additionally, prioritize resources vital for core functionality, like interactive elements and form components. Utilize (CDNs) to deliver resources from servers closer to users, reducing latency. Minimize HTTP redirects to avoid additional wait time.

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Ahmed Essam

Frontend Developer | Angular | DEPI Trainee
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Identify and prioritize resources needed to render above-the-fold content (critical path). Load critical CSS and JavaScript inline or as early as possible in the document head to minimize render-blocking.

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Aayush Bharti

????Coding Enthusiast ? Open to Opportunities & Collaborations ?? ? Love to Build Stuff??
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Optimizing web page performance hinges on prioritizing resource loading efficiently. Focus first on loading critical CSS and above-the-fold content using inline styles to avoid render-blocking. Defer or async non-essential JavaScript to speed up initial renders. Implement lazy loading for images and videos to conserve bandwidth and enhance load times. Utilize resource hints like preload for critical assets, prefetch for future resources, and preconnect to reduce latency. Optimize font loading with font-display: swap. Leverage HTTP/2 for multiplexing and server push, use CDNs for geographical content distribution, and employ service workers for strategic caching. These strategies collectively ensure a faster, more responsive web experience.

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2 Resource Hints

Browsers can be instructed on how to manage resources using hints like preload , prefetch , and preconnect . Use preload to load essential resources such as fonts and critical scripts early in the page load process. Prefetch is useful for loading resources that will be needed in the next navigation or user interaction, while preconnect establishes early connections to important third-party domains. These hints help the browser anticipate and manage resource loading more efficiently.

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Ahmed Essam

Frontend Developer | Angular | DEPI Trainee
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Use resource hints such as <link rel="preload"> and <link rel="prefetch"> to give browsers early hints about resources needed for subsequent navigation or page rendering. Preload critical resources like fonts, CSS, and JavaScript to expedite their loading.

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UZAIR WAHEED

Software Engineer @ PRAL, FBR | Angular, .Net Core, Rest API, MS SQL, MS CRM 365
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Resource hints instruct the browser to perform certain actions ahead of time that could improve loading performance. Resource hints can perform actions such as performing early DNS lookups, connecting to servers ahead of time, and even fetching resources before the browser would ordinarily discover them.

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Shivani Kaushik

Full-Stack Web Developer | Java Enthusiast | Next.js & TypeScript Explorer | AI/ML Enthusiast | Podcast Aficionado ??
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To prioritize resources for faster web page performance, follow these strategies: 1. Critical Rendering Path: - Focus on loading resources necessary for initial page rendering. - Inline critical CSS directly in the HTML `<head>` to avoid render-blocking. 2. Async and Defer JavaScript:- Use `async` or `defer` attributes to load JavaScript without blocking rendering. <script src="script.js" defer></script> 3. Lazy Loading:- Implement lazy loading for images and other media that are not immediately visible. <img src="image.jpg" loading="lazy" alt="description"> By implementing these steps, you ensure faster initial page rendering and an improved user experience.

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Shivani Kaushik

Full-Stack Web Developer | Java Enthusiast | Next.js & TypeScript Explorer | AI/ML Enthusiast | Podcast Aficionado ??
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To prioritize resources for faster web page performance, follow these strategies: 1. Critical Rendering Path: - Focus on loading resources necessary for initial page rendering. - Inline critical CSS directly in the HTML `<head>` to avoid render-blocking. 2. Async and Defer JavaScript:- Use `async` or `defer` attributes to load JavaScript without blocking rendering. <script src="script.js" defer></script> 3. Lazy Loading:- Implement lazy loading for images and other media that are not immediately visible. <img src="image.jpg" loading="lazy" alt="description"> By implementing these steps, you ensure faster initial page rendering and an improved user experience.

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MD Sabbir Hasan

Business Development Executive at Sayeef Digital Agency ??Certified Website Designer, Digital Marketer & Award Winner from Bangladesh Gov. | Supporting Small & Start-Ups Businesses to Thrive
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Browsers can manage resources using hints like preload, prefetch, and preconnect. Use preload to load essential resources such as fonts and critical scripts early. Prefetch loads resources needed for the next navigation or interaction. Preconnect establishes early connections to important third-party domains. These hints help the browser anticipate and streamline resource loading, improving overall efficiency.

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3 Lazy Loading

Lazy loading is a strategy to delay loading non-critical resources until they're needed, which can significantly improve load times. Images and videos are prime candidates for lazy loading; they're only requested when they enter the viewport or are about to. Implementing lazy loading can be as simple as adding the loading="lazy" attribute to <img> and <iframe> elements, signaling the browser to hold off on loading these resources until necessary.

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Yash J.

Senior Full Stack Developer at Siemens | Angular | Nodejs | AWS
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Lazy loading a performance optimization strategy plays a critical role in how resources are loaded on a webpage. It's a strategy to identify resources as non-blocking and load these only when needed. This can significantly improve web performance, reduce bandwidth usage and enhance user engagement.

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Md Rashedul Hoque

Full Stack Web Developer PHP (Laravel), Javascript, Typescript, Jquery,AJAX, MySQL, PostgreSql, MSSQL, Docker, AWS, GIT, Bootstrap5, HTML5, SCSS/CSS, Paython Basic, iOS(Swift), C#
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Lazy loading is a performance optimization mechanism to load user interface so fast. It make the scope of user user form without user blocking from user interface end. It's a good visualization technic for faster loading. behind the UI all data will load without bad impression of a user. its ensure the optimum use of system resources and minimum code execution for performing the user event.

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Shivani Kaushik

Full-Stack Web Developer | Java Enthusiast | Next.js & TypeScript Explorer | AI/ML Enthusiast | Podcast Aficionado ??
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Lazy loading delays loading non-critical resources, improving load times. Images and videos are ideal candidates, loading only when they enter the viewport. Implementing lazy loading is simple: 1. For images: ```html <img src="image.jpg" loading="lazy" alt="description"> ``` 2.For iframes: <iframe src="video.html" loading="lazy"></iframe> Adding `loading="lazy"` tells the browser to defer loading these resources until they are needed, enhancing page performance.

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Ahmed Essam

Frontend Developer | Angular | DEPI Trainee
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Implement lazy loading for non-critical resources such as images, iframes, and videos. Load these resources only when they enter the viewport, reducing initial page load time.

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UZAIR WAHEED

Software Engineer @ PRAL, FBR | Angular, .Net Core, Rest API, MS SQL, MS CRM 365
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Lazy loading means waiting to render content on a webpage until the user or the browser needs it. Lazy loading can help speed up webpage load times.

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4 Script Management

JavaScript can easily become a bottleneck if not managed correctly. Prioritize loading and execution of scripts that are essential for user interaction. Use the async attribute for scripts that do not depend on other scripts and the defer attribute for those that do but are not critical for initial render. This allows the browser to continue parsing HTML while scripts are being fetched in parallel, executing them only when the document parsing is complete.

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Ahmed Essam

Frontend Developer | Angular | DEPI Trainee
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Load JavaScript asynchronously or defer its execution to prevent render-blocking. Prioritize scripts that are necessary for page functionality and delay loading of non-essential scripts.

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UZAIR WAHEED

Software Engineer @ PRAL, FBR | Angular, .Net Core, Rest API, MS SQL, MS CRM 365
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Web script, a computer programming language for adding dynamic capabilities to World Wide Web pages. Web pages marked up with HTML (hypertext markup language) or XML (extensible markup language) are largely static documents.

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MD Sabbir Hasan

Business Development Executive at Sayeef Digital Agency ??Certified Website Designer, Digital Marketer & Award Winner from Bangladesh Gov. | Supporting Small & Start-Ups Businesses to Thrive
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JavaScript can become a bottleneck if not managed well. Prioritize essential scripts for user interaction, and use the async attribute for scripts that don't depend on others. Use defer for scripts that do but aren't critical for initial rendering. This allows the browser to parse HTML and fetch scripts in parallel, executing them only after document parsing is complete, improving performance and user experience.

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5 CSS Optimization

CSS directly affects how quickly a page can render. To prioritize resource loading, keep your CSS lean and deliver it as swiftly as possible. Splitting your CSS into critical and non-critical files helps; inline the critical path CSS to reduce render-blocking and load the rest asynchronously. Also, consider using CSS containment properties to limit the scope of styles to specific areas, reducing the amount of work the browser needs to do when rendering a page.

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UZAIR WAHEED

Software Engineer @ PRAL, FBR | Angular, .Net Core, Rest API, MS SQL, MS CRM 365
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When developing a website, you need to consider how the browser is handling the CSS on your site. To mitigate any performance issues that CSS might be causing, you should optimize it. For example, you should optimize the CSS to mitigate render-blocking and minimize the number of required reflows.

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Ahmed Essam

Frontend Developer | Angular | DEPI Trainee
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Optimize CSS delivery by eliminating render-blocking CSS and reducing file size. Inline critical CSS and asynchronously load non-critical CSS. Minify CSS files to reduce network transfer time.

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Arfin Hasib

Front-End Developer | Passionate about Crafting Seamless UI/UX Experiences | YouTuber | I consider myself a developer who can design
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Minimize the amount of CSS code needed for initial rendering (critical CSS). Techniques like inlining critical CSS or using a separate critical CSS file can help. Deliver CSS efficiently. Consider using a Content Delivery Network (CDN) to serve static assets like CSS files from geographically distributed servers, reducing latency.

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MD Sabbir Hasan

Business Development Executive at Sayeef Digital Agency ??Certified Website Designer, Digital Marketer & Award Winner from Bangladesh Gov. | Supporting Small & Start-Ups Businesses to Thrive
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CSS directly impacts page render speed. Keep your CSS lean and deliver it swiftly by splitting it into critical and non-critical files. Inline critical path CSS to reduce render-blocking, and load the rest asynchronously. Use CSS containment properties to limit the scope of styles, reducing the browser's rendering workload. Prioritizing resource loading this way enhances performance and provides a smoother user experience.

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6 Caching Strategies

Caching is a powerful way to improve repeat visits to your site. By implementing proper caching strategies, you can instruct browsers to store key resources locally. Use cache headers to control how long resources are stored before a new copy is fetched from the server. Service workers can also be employed to cache resources and manage how they're served, ensuring that repeat visitors experience even faster load times as many resources can be loaded from the cache rather than the network.

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Ahmed Essam

Frontend Developer | Angular | DEPI Trainee
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Leverage browser caching by setting appropriate cache-control headers for static resources. Use versioning or cache-busting techniques for assets to ensure that updated resources are fetched when necessary. Utilize CDN caching for improved delivery of assets to users across different geographic locations.

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Shivani Kaushik

Full-Stack Web Developer | Java Enthusiast | Next.js & TypeScript Explorer | AI/ML Enthusiast | Podcast Aficionado ??
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Implement caching strategies to enhance site performance: 1. Cache Headers: Set cache-control headers to dictate resource storage duration. 2. Service Workers: Utilize service workers to cache and serve resources, ensuring faster load times for repeat visitors.

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MD Sabbir Hasan

Business Development Executive at Sayeef Digital Agency ??Certified Website Designer, Digital Marketer & Award Winner from Bangladesh Gov. | Supporting Small & Start-Ups Businesses to Thrive
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Caching boosts repeat visits by storing key resources locally. Use cache headers to set how long resources are stored before refreshing. Service workers enhance this by caching and serving resources efficiently, ensuring faster load times for returning visitors. Implementing these strategies means users enjoy quicker access, improving their experience and engagement with your site.

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7 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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Arfin Hasib

Front-End Developer | Passionate about Crafting Seamless UI/UX Experiences | YouTuber | I consider myself a developer who can design
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Image Optimization: Reduce image file sizes using compression techniques or consider using next-gen image formats like WebP and AVIF for smaller file sizes with similar quality. Minimize HTTP Requests: Combine multiple CSS or JavaScript files into fewer files to reduce the number of HTTP requests the browser needs to make. Optimize Server Response Time: Ensure your server delivers content quickly. A slow server can bottleneck even the most optimized page. Tools like Google PageSpeed Insights can help identify areas for improvement across these factors. By implementing these strategies, you can prioritize resource loading effectively, resulting in a faster and more user-friendly web experience.

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Ahmed Essam

Frontend Developer | Angular | DEPI Trainee
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Resource Prioritization: Determine the importance of each resource based on user experience and functionality. Network Conditions: Consider the impact of network conditions on resource loading. Prioritize resources that are essential for users with slower connections. Third-Party Resources: Evaluate the performance impact of third-party scripts and resources. Load them asynchronously or defer their loading where possible. Progressive Enhancement: Follow the principle of progressive enhancement to ensure that core functionality is available even if certain resources fail to load. Continuous Monitoring: Regularly monitor and optimize resource loading to adapt to changing requirements and improve page performance over time.

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PRIYANK RAI

Looking for remote/freelance Full stack web development roles
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In short : 1?? use browser hits to play with a priority of content loading and utilize them to load the first visible content by fetching in parallel during parsing using preload. 2?? Use SVG wherever possible 3?? Leverage the caching provided by the browser for consistent and fast UX. 4?? Use Inline CSS wherever possible 5?? Defer the scripts that are not crucial 6?? Preload fonts and first visible images to improve LCP. 7?? Minimize the overall number of external fetch request

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How do you prioritize which resources to load first for faster web page performance?

1

2

3

4

5

6

7

1 Critical Paths

2 Resource Hints

3 Lazy Loading

4 Script Management

5 CSS Optimization

6 Caching Strategies

7 Here’s what else to consider

Web Development

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How do you prioritize which resources to load first for faster web page performance?

1

2

3

4

5

6

7

1 Critical Paths

2 Resource Hints

3 Lazy Loading

4 Script Management

5 CSS Optimization

6 Caching Strategies

7 Here’s what else to consider

Web Development

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