Website Speed and Core Web Vitals

Course: Digital Marketing

Topic: Website Performance Optimization, Page Loading Speed, Largest Contentful Paint (LCP), Interaction to Next Paint (INP), Cumulative Layout Shift (CLS), and Technical SEO

Course Link: JustAcademy Digital Marketing Course

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1. Introduction to Website Speed and Core Web Vitals

Website speed and Core Web Vitals are important aspects of technical SEO and website performance optimization. They help website owners understand how quickly a webpage loads, how smoothly it responds to user interactions, and whether its layout remains visually stable while loading.

A slow website can frustrate visitors, increase abandonment, and make it harder for users to complete actions such as submitting a contact form, purchasing a product, or registering for a course. A fast, responsive website provides a better user experience and can support business goals such as lead generation and online sales.

Core Web Vitals are a set of Google-defined metrics that measure important aspects of real-world user experience. The three current Core Web Vitals are Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS).

Website performance optimization involves improving server response, reducing unnecessary resources, optimizing images, minimizing JavaScript execution, improving caching, and preventing unexpected layout changes.

Key Concepts

• Website Speed: How quickly a website loads and becomes usable.
• Page Performance: How efficiently a webpage loads, responds to interactions, and renders content.
• Core Web Vitals: Metrics that evaluate loading performance, responsiveness, and visual stability.
• Largest Contentful Paint (LCP): Measures when the largest relevant content element in the visible area is rendered.
• Interaction to Next Paint (INP): Measures a webpage's responsiveness to user interactions.
• Cumulative Layout Shift (CLS): Measures unexpected visual movement of page elements.
• Technical SEO: Website optimization that helps search engines crawl, process, and understand webpages.
• PageSpeed Optimization: Techniques used to improve loading speed and overall website responsiveness.

2. Learning Objectives

After completing this topic, learners will be able to:

• Understand the importance of website speed in digital marketing.
• Explain the three Core Web Vitals and their recommended thresholds.
• Identify common causes of slow website performance.
• Measure website speed using performance testing tools.
• Optimize images, CSS, JavaScript, fonts, and server responses.
• Understand browser caching, compression, and content delivery networks.
• Improve loading performance and responsiveness on mobile devices.
• Identify and reduce unexpected layout shifts.
• Use Google PageSpeed Insights and Google Search Console.
• Create a practical website performance optimization plan.

3. What Is Website Speed?

Website speed refers to how quickly a webpage loads its resources, displays meaningful content, and becomes responsive to visitors. It includes more than the time required for the first part of a page to appear.

A website might display a heading quickly but still feel slow if its main image takes several seconds to load or its buttons remain unresponsive. Effective optimization therefore considers loading speed, responsiveness, and visual stability together.

Example

Consider two digital marketing websites:

Website A generally provides a better user experience because it displays important content quickly, responds to user input, and avoids unexpected layout changes.

Benefits of Website Speed Optimization

• Improves user experience.
• Helps visitors access important information faster.
• Can reduce abandonment caused by slow interactions.
• Supports mobile usability.
• Can improve conversion opportunities when performance is a barrier.
• Helps search engines evaluate the page experience alongside other ranking signals.
• Reduces unnecessary resource loading and bandwidth usage.

4. What Are Core Web Vitals?

Core Web Vitals are a group of metrics developed by Google to measure important real-world user experience characteristics. They focus on how quickly the main content appears, how quickly the page responds to user actions, and how stable the layout remains.

The three Core Web Vitals are:

1. Largest Contentful Paint (LCP): Loading performance.
2. Interaction to Next Paint (INP): Responsiveness.
3. Cumulative Layout Shift (CLS): Visual stability.

Core Web Vitals Thresholds

These thresholds are evaluated at the 75th percentile of real-user visits, with mobile and desktop assessed separately. A page or URL group generally passes the Core Web Vitals assessment when all three metrics meet the good thresholds, provided sufficient field data is available.

5. Largest Contentful Paint (LCP)

Largest Contentful Paint measures how long it takes for the largest content element visible within the viewport to render. This element is often a large image, a video poster image, or a substantial block of text.

LCP helps indicate when visitors can see the main content of a webpage. A delayed LCP may make a page feel slow even when smaller elements have already appeared.

Recommended LCP Thresholds

Factors That Affect LCP

• Slow server response time.
• Large, unoptimized images.
• Render-blocking CSS and JavaScript.
• Slow network connections.
• Excessive third-party scripts.
• Late discovery of the main image resource.
• Client-side rendering that delays meaningful content.
• Unnecessary redirects before the page begins loading.

How to Improve LCP

1. Improve server response: Optimize backend processing, database queries, and hosting configuration.
2. Optimize the main image: Use appropriate dimensions and efficient formats such as WebP or AVIF when supported.
3. Prioritize important resources: Ensure the main image and critical CSS are discovered early.
4. Reduce render-blocking resources: Remove unnecessary CSS and defer non-critical scripts where appropriate.
5. Use caching: Cache suitable static assets to reduce repeated downloads.
6. Use a CDN: Deliver static assets from servers closer to visitors where appropriate.
7. Avoid unnecessary lazy loading: Do not lazy-load the main image if doing so delays LCP.

Example of LCP Optimization

Suppose a digital marketing landing page displays a large banner image that takes five seconds to render. The developer compresses the image, uses a suitable modern format, corrects its dimensions, and ensures it is discovered early by the browser.

These changes may reduce the time required to display the main content. The actual improvement should be confirmed through performance measurements.

6. Interaction to Next Paint (INP)

Interaction to Next Paint measures how responsive a webpage is to user interactions, including clicks, taps, and keyboard input. It considers interactions throughout a page visit and reflects the delay before the browser displays the next visual update after an interaction.

A page can load quickly but still feel slow if clicking a button causes a long delay before the page responds.

Recommended INP Thresholds

Common Causes of Poor INP

• Long-running JavaScript tasks.
• Excessive event handlers.
• Heavy DOM manipulation.
• Large JavaScript bundles.
• Complex calculations running on the main thread.
• Unnecessary third-party scripts.
• Expensive rendering and style recalculations.

How to Improve INP

1. Break long JavaScript tasks into smaller tasks.
2. Reduce unnecessary JavaScript execution.
3. Remove unused libraries and scripts.
4. Optimize event handlers for clicks, taps, and keyboard input.
5. Avoid unnecessary DOM updates.
6. Use code splitting and load features when needed.
7. Delay non-essential third-party scripts where appropriate.
8. Use a Web Worker for suitable intensive computations that do not need direct DOM access.

Example of INP Optimization

Imagine a course registration page where clicking the Submit button freezes the browser for 700 milliseconds because of a large JavaScript task. The developer reduces unnecessary processing and divides the work into smaller tasks.

As a result, the browser may respond more quickly to the interaction. The improvement should be tested using field data and suitable laboratory diagnostics.

7. Cumulative Layout Shift (CLS)

Cumulative Layout Shift measures unexpected visual movement of page elements during the page's lifetime. A layout shift occurs when an element changes position without the visitor expecting it.

For example, a visitor may try to click a Register button, but a banner loads above it and moves the button downward. This can lead to accidental clicks and a frustrating experience.

Recommended CLS Thresholds

Common Causes of CLS

• Images without defined dimensions.
• Advertisements that appear without reserved space.
• Web fonts that cause text to reflow.
• Content inserted above existing content.
• Late-loading banners and promotional sections.
• Dynamic widgets that change page dimensions.
• Animations that move elements in ways that affect layout.

How to Improve CLS

1. Specify width and height attributes for images and videos.
2. Reserve space for advertisements and embedded content.
3. Use suitable font-loading strategies.
4. Avoid inserting new content above existing content unless it is triggered by a user interaction.
5. Use CSS aspect ratios for media containers.
6. Prefer transform-based animations when appropriate instead of properties that trigger layout changes.
7. Test pages while images, fonts, banners, and widgets load.

Example of CLS Optimization

A website's hero image has no reserved dimensions, so the heading and call-to-action button move when the image loads. Adding the correct width, height, or aspect ratio allows the browser to reserve space before the image appears.

This can reduce unexpected layout movement and improve the visitor's experience.

8. Difference Between LCP, INP, and CLS

9. Website Speed vs. Core Web Vitals

Website speed is a broad concept that includes many aspects of page loading and responsiveness. Core Web Vitals focus on three specific dimensions of the real-world user experience.

A website may have a high laboratory performance score but still have poor Core Web Vitals in real-world usage. Both types of measurement are useful and should be interpreted together.

10. Common Causes of Slow Website Speed

10.1 Large Images

Large image files increase download time and consume bandwidth. Use appropriately sized images, compression, responsive image delivery, and modern formats when supported.

10.2 Excessive JavaScript

Large scripts can delay rendering and block the browser's main thread. Remove unnecessary scripts, split code, and defer non-critical work where appropriate.

10.3 Unoptimized CSS

Large stylesheets and render-blocking CSS can delay the first meaningful visual display. Remove unused CSS and prioritize the styles needed for the initial viewport.

10.4 Slow Server Response

Slow database queries, expensive application processing, overloaded hosting, or poor caching can delay the delivery of HTML.

10.5 Too Many HTTP Requests

Pages that load many separate resources may incur additional network overhead. Reduce unnecessary assets and use efficient bundling strategies appropriate to the application.

10.6 Third-Party Scripts

Advertising, analytics, chat widgets, embedded videos, and marketing tools may introduce network requests and JavaScript execution costs. Load only the tools that provide value and configure them carefully.

10.7 Poor Caching

Without suitable caching, browsers may repeatedly download static assets. Configure cache policies based on the type of resource and how often it changes.

10.8 Unoptimized Fonts

Large font files and inefficient font loading can delay text rendering and contribute to layout shifts. Use appropriate font subsets, preload only critical fonts when justified, and configure fallback fonts carefully.

11. Image Optimization for Website Performance

Image optimization is one of the most useful ways to reduce page weight and improve loading performance. Images often represent a substantial portion of a webpage's transferred data.

Best Practices

• Use WebP or AVIF where appropriate and supported by the delivery setup.
• Compress images without unacceptable quality loss.
• Resize images to match their display dimensions.
• Use responsive images with srcset and sizes when appropriate.
• Lazy-load below-the-fold images.
• Avoid lazy-loading the main image responsible for LCP.
• Specify image dimensions to reduce layout shifts.

Example: Responsive Image

<img
    src="images/seo-course-800.webp"
    srcset="images/seo-course-400.webp 400w,
            images/seo-course-800.webp 800w,
            images/seo-course-1200.webp 1200w"
    sizes="(max-width: 600px) 100vw, 800px"
    width="800"
    height="450"
    alt="Digital marketing SEO training"
    loading="lazy"
>

This example allows the browser to select a suitable image source for the available display size. Lazy loading is appropriate for images that are not immediately needed in the initial viewport.

12. CSS Optimization

CSS controls the visual appearance and layout of a webpage. Poorly optimized CSS can delay rendering, increase resource size, and contribute to inefficient browser work.

CSS Optimization Techniques

• Remove unused CSS rules.
• Minify CSS files for production.
• Reduce unnecessary stylesheet dependencies.
• Load critical styles efficiently.
• Defer non-critical styling when appropriate.
• Avoid unnecessarily complex selectors and expensive style recalculations.
• Use efficient layout and animation techniques.

Example

/* Readable development CSS */
.hero-section {
    padding: 40px;
    background-color: #f5f5f5;
}

/* Minified production CSS */
.hero-section{padding:40px;background-color:#f5f5f5}

Minification removes unnecessary characters from CSS, reducing file size without changing its intended behavior.

13. JavaScript Optimization

JavaScript adds functionality to websites, including interactive forms, menus, animations, calculators, and dynamic content. However, excessive JavaScript can delay page rendering and reduce responsiveness.

JavaScript Optimization Techniques

• Remove unused code and dependencies.
• Use code splitting to load only the required functionality.
• Defer non-critical scripts where appropriate.
• Use asynchronous loading for suitable independent scripts.
• Break long-running tasks into smaller tasks.
• Reduce unnecessary event listeners and DOM updates.
• Audit third-party JavaScript.
• Use Web Workers for suitable intensive tasks.

Example: Defer a Script

<script src="/js/main.js" defer></script>

The defer attribute allows an external classic script to download while HTML parsing continues and executes it after parsing completes, before the document's DOMContentLoaded event. Its suitability depends on script dependencies and application requirements.

14. Browser Caching

Browser caching stores eligible resources locally so that a visitor's browser can reuse them on later visits. It can reduce repeated downloads and improve perceived loading speed.

Types of Cached Resources

• Images.
• CSS files.
• JavaScript files.
• Fonts.
• Other static resources.

Example: Cache-Control Header

Cache-Control: public, max-age=31536000, immutable

This header can be suitable for versioned static assets that are not changed in place. The long cache duration should not be applied blindly to HTML documents or frequently changing files.

Benefits of Caching

• Reduces repeated network requests.
• Improves repeat-visit performance.
• Reduces bandwidth usage.
• Can lower server workload.

15. Content Delivery Network (CDN)

A Content Delivery Network is a distributed network of servers that delivers content from locations closer to users. CDNs commonly serve images, stylesheets, JavaScript, and other static assets. Some also provide caching and optimization features for HTML responses.

Benefits of a CDN

• Can reduce network latency for geographically distributed visitors.
• Can improve delivery of static resources.
• Can reduce load on the origin server.
• May provide additional security and traffic management features.
• Can support more consistent performance across regions.

A CDN does not automatically fix slow application code, excessive JavaScript, or layout shifts. Performance should still be measured after implementation.

16. Server Response Time and Hosting

Server response time is the time taken for the server to begin responding to a request. Slow backend processing can delay the delivery of HTML and negatively affect the time at which important content appears.

Common Causes of Slow Server Responses

• Insufficient server resources.
• Slow database queries.
• Unoptimized application code.
• Excessive external API requests.
• Missing server-side caching.
• High traffic or resource contention.
• Unnecessary redirects.

Ways to Improve Server Performance

1. Use hosting suitable for the website's traffic and application requirements.
2. Optimize database queries and indexes.
3. Cache suitable server responses and database results.
4. Reduce unnecessary backend processing.
5. Monitor server logs and application performance.
6. Use a CDN or edge caching where appropriate.
7. Keep application frameworks and dependencies maintained.

17. Mobile Website Performance

Mobile visitors may use slower networks, less powerful devices, or limited data plans. A website that performs well on a desktop computer may behave differently on a mobile device.

Mobile Optimization Best Practices

• Use responsive layouts.
• Deliver appropriately sized images.
• Reduce unnecessary JavaScript and CSS.
• Make buttons and interactive elements easy to use.
• Prevent content from shifting as it loads.
• Optimize font delivery and text rendering.
• Test performance on realistic mobile devices and network conditions.
• Prioritize important content and functionality.

18. Understanding Lab Data and Field Data

Website performance tools use two important types of measurement: laboratory data and field data.

Use laboratory tests to identify possible causes and field data to understand real-world performance. Neither should be interpreted in isolation.

19. Google PageSpeed Insights

Google PageSpeed Insights analyzes a webpage's performance on mobile and desktop. It can display field data when sufficient real-user data is available and laboratory diagnostics generated using Lighthouse.

How to Use PageSpeed Insights

1. Open Google PageSpeed Insights.
2. Enter the complete URL of the webpage you want to test.
3. Run the analysis.
4. Review the mobile and desktop results.
5. Check LCP, INP, and CLS when field data is available.
6. Review the Lighthouse Performance score and diagnostics.
7. Identify the highest-impact issues.
8. Implement improvements and test again.

Important Performance Diagnostics

• Reduce unused JavaScript.
• Eliminate or reduce render-blocking resources.
• Properly size images.
• Serve images in efficient formats.
• Reduce unused CSS.
• Improve server response time.
• Reduce main-thread work.
• Preload critical resources when appropriate.

PageSpeed Insights recommendations are diagnostic clues. Review the context of each recommendation before changing the website.

20. Google Search Console Core Web Vitals Report

Google Search Console provides a Core Web Vitals report based on real-user data from the Chrome User Experience Report when sufficient data is available. It groups similar URLs and categorizes their performance as Good, Needs Improvement, or Poor.

How to Review the Report

1. Open Google Search Console.
2. Select the verified website property.
3. Open the Core Web Vitals report.
4. Review mobile and desktop data separately.
5. Identify URL groups with Poor or Needs Improvement status.
6. Open the issue details and review representative URLs.
7. Run performance tests on representative pages.
8. Fix the underlying template or resource problem.
9. Monitor the report to evaluate real-world results.

Some pages may not appear in the report if there is insufficient field data. Use PageSpeed Insights or Lighthouse to test individual URLs when field data is unavailable.

21. Lighthouse Performance Testing

Lighthouse is an automated auditing tool available through Chrome DevTools and other supported interfaces. It can evaluate performance in a controlled environment and provide diagnostics for loading, rendering, and other aspects of a webpage.

How to Run Lighthouse in Chrome

1. Open the webpage in Google Chrome.
2. Open Chrome DevTools using the browser menu or keyboard shortcut.
3. Select the Lighthouse panel if available.
4. Choose the relevant device and audit settings.
5. Run the performance audit.
6. Review the performance score and diagnostic opportunities.
7. Address important issues and repeat the test.

Lighthouse scores can vary between runs because of device conditions, network settings, and other factors. A laboratory score is not the same as a real-user Core Web Vitals assessment.

22. Common Website Speed Problems and Solutions

23. Website Speed Optimization Workflow

A structured workflow helps identify the biggest performance problems and prevents unnecessary changes.

Start Website Performance Audit
            |
            v
Test Important URLs
            |
            v
Collect Lab and Field Data
            |
            v
Identify Main Bottlenecks
            |
            v
Prioritize High-Impact Issues
            |
            v
Optimize Images, CSS, JavaScript,
Server, Fonts and Caching
            |
            v
Retest the Same URLs
            |
            v
Compare Before-and-After Results
            |
            v
Monitor Real-User Performance

Step-by-Step Optimization Process

1. Establish a baseline: Test important landing pages, service pages, blog posts, and forms.
2. Collect measurements: Record LCP, INP, CLS, performance scores, and relevant diagnostics.
3. Identify the root cause: Determine whether the problem comes from images, JavaScript, server response, layout shifts, or third-party tools.
4. Prioritize fixes: Focus on high-impact issues affecting important pages and templates.
5. Implement changes: Optimize resources and application behavior.
6. Retest: Use the same URLs and comparable testing conditions.
7. Validate user experience: Check real-user data when available.
8. Monitor continuously: Recheck performance after website updates and deployments.

24. Website Speed and Digital Marketing Performance

Website speed affects how easily visitors can interact with digital marketing campaigns. A campaign may generate clicks, but a slow landing page can create friction before visitors read the offer or complete the desired action.

Impact on Marketing Activities

• SEO: Page experience is one aspect of Google's broader ranking systems, alongside many other signals.
• Paid Advertising: Faster landing pages can reduce waiting and improve the experience after an ad click.
• Lead Generation: Responsive forms can make it easier for visitors to submit enquiries.
• E-Commerce: Stable product pages and responsive checkout interactions can reduce usability problems.
• Content Marketing: Faster articles can help readers access information with less delay.
• Mobile Marketing: Efficient pages are especially useful for visitors using slower connections or less powerful devices.

Improving Core Web Vitals does not guarantee higher rankings, increased sales, or better advertising results. Measure performance alongside conversions, engagement, traffic, and other relevant business indicators.

25. Core Web Vitals and SEO

Google uses Core Web Vitals within its broader page experience and ranking systems. Good Core Web Vitals support a better user experience, but they do not guarantee a top search position.

SEO Best Practices

• Optimize important landing pages for loading performance.
• Improve the responsiveness of menus, forms, and interactive elements.
• Prevent unexpected shifts in content and buttons.
• Test mobile and desktop performance separately.
• Review field data rather than relying only on a single laboratory score.
• Combine performance improvements with useful content, relevant keywords, internal linking, and sound technical SEO.

26. Practical Project: Website Speed and Core Web Vitals Audit

Project Objective

Perform a website performance audit for a sample digital marketing training website and prepare a report containing key issues, proposed fixes, and before-and-after measurements.

Pages to Test

• Homepage.
• Digital marketing course page.
• Course registration page.
• Blog article page.
• Contact page.

Audit Table

Project Steps

1. Choose a website and record the URLs to be tested.
2. Run PageSpeed Insights for each page.
3. Record available LCP, INP, and CLS field data.
4. Run Lighthouse audits to investigate laboratory performance.
5. Identify the most important performance bottlenecks.
6. Recommend or implement appropriate fixes.
7. Retest the same URLs under comparable conditions.
8. Compare the before-and-after results.
9. Document remaining issues and create a monitoring plan.

Sample Performance Report Template

Use actual test results in the report. Do not assume that a particular optimization will always produce the same performance improvement across different websites or devices.

27. Best Practices for Website Speed and Core Web Vitals

• Use appropriately sized and compressed images.
• Prioritize the main content and critical resources.
• Avoid lazy-loading the main LCP image.
• Remove unnecessary CSS and JavaScript.
• Reduce long-running JavaScript tasks.
• Specify dimensions for images and videos.
• Reserve space for ads, embeds, and dynamic components.
• Configure browser caching for suitable assets.
• Use a CDN where it benefits your audience and infrastructure.
• Improve backend processing and server reliability.
• Audit third-party marketing scripts.
• Test both mobile and desktop experiences.
• Use laboratory data to diagnose and field data to monitor real-world performance.
• Retest after website redesigns, plugin changes, and major deployments.
• Monitor performance continuously rather than optimizing only once.

28. Interview Questions and Answers

Q1. What is website speed?

Website speed refers to how quickly a webpage loads its resources, displays meaningful content, and becomes responsive to visitors.

Q2. What are Core Web Vitals?

Core Web Vitals are Google's metrics for loading performance, responsiveness, and visual stability: LCP, INP, and CLS.

Q3. What is LCP?

Largest Contentful Paint measures the time taken for the largest content element in the visible viewport to render.

Q4. What is the recommended LCP threshold?

A good LCP value is 2.5 seconds or less at the 75th percentile of real-user visits.

Q5. What is INP?

Interaction to Next Paint measures a webpage's responsiveness to user interactions throughout a visit.

Q6. What is the recommended INP threshold?

A good INP value is 200 milliseconds or less.

Q7. What is CLS?

Cumulative Layout Shift measures unexpected visual movement of page elements.

Q8. What is the recommended CLS threshold?

A good CLS score is 0.1 or less.

Q9. How can LCP be improved?

Improve server response time, optimize the main image, prioritize critical resources, and reduce render-blocking CSS and JavaScript.

Q10. How can INP be improved?

Reduce long JavaScript tasks, optimize event handlers, minimize unnecessary DOM work, and reduce non-essential scripts.

Q11. How can CLS be improved?

Specify media dimensions, reserve space for dynamic content, optimize font loading, and prevent unexpected content insertion.

Q12. What is PageSpeed Insights?

PageSpeed Insights is a Google tool that provides laboratory performance diagnostics and available real-user performance data for webpages.

Q13. What is Lighthouse?

Lighthouse is an automated auditing tool that evaluates webpage performance and provides diagnostic information.

Q14. What is the difference between field data and lab data?

Field data reflects actual user experiences, while lab data is collected under controlled testing conditions.

Q15. How does image optimization improve website speed?

Optimized images reduce file size and download time, potentially improving loading performance and bandwidth efficiency.

Q16. What is browser caching?

Browser caching allows a browser to reuse eligible resources from previous visits instead of downloading them again.

Q17. What is a CDN?

A Content Delivery Network distributes content through servers in different locations to improve delivery efficiency for users.

Q18. Does a good Lighthouse score guarantee good Core Web Vitals?

No. Lighthouse provides laboratory measurements, while Core Web Vitals assessment is based on real-user field data when sufficient data is available.

Q19. Do Core Web Vitals guarantee better rankings?

No. They are part of Google's broader page experience and ranking systems, but rankings depend on many factors.

Q20. How often should website speed be tested?

Test after major changes and periodically during routine technical SEO maintenance. Monitor real-user data when available.

29. Conclusion

Website speed and Core Web Vitals are important parts of technical SEO and digital marketing. A well-optimized website loads its main content quickly, responds smoothly to user interactions, and maintains a stable layout.

To improve performance, optimize images, reduce unnecessary CSS and JavaScript, improve server response times, configure caching, and reserve space for dynamic content. Use PageSpeed Insights and Lighthouse to diagnose issues, and Google Search Console to monitor real-world Core Web Vitals data when available.

Remember that a high performance score does not guarantee search rankings or conversions. The objective is to create a fast, stable, accessible, and useful experience that helps visitors complete their goals.

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Additional Learning Resources

• Google Search Central: Understanding Core Web Vitals
• Google PageSpeed Insights
• web.dev: Web Vitals
• Google Search Console: Core Web Vitals Report