Largest Contentful Paint (LCP) is a Core Web Vitals metric that measures how long it takes for the largest visible content element on a page to fully render, with a good score being 2.5 seconds or less. LCP is one of three Core Web Vitals that Google uses as ranking factors, making it essential for both user experience and SEO. The largest element is typically a hero image, video thumbnail, or large text block.
Unlike older metrics that measured when any content appeared, LCP focuses on when the main content is visible and usable. This better reflects what users actually experience when loading a page. Poor LCP scores lead to higher bounce rates, lower conversions, and reduced search rankings. Optimizing LCP is a key part of technical SEO.
Key Takeaways: Largest Contentful Paint
- Definition: Time until the largest visible content element is fully rendered
- Good score: 2.5 seconds or less
- Needs improvement: Between 2.5 and 4.0 seconds
- Poor score: More than 4.0 seconds
- SEO impact: Core Web Vital used as a Google ranking factor since 2021
8 Ways to Improve LCP Score
- Optimize images – Compress, use modern formats (WebP/AVIF), and set dimensions
- Use a CDN – Serve content from servers closer to users
- Preload critical resources – Add preload hints for LCP images and fonts
- Remove render-blocking resources – Defer non-critical CSS and JavaScript
- Optimize server response time (TTFB) – Improve hosting and database queries
- Implement lazy loading – But exclude the LCP element from lazy loading
- Minify CSS and JavaScript – Reduce file sizes to speed up loading
- Use browser caching – Cache static assets for returning visitors
What Is the Largest Contentful Paint Element?
The LCP element is the largest image, video, or text block visible in the viewport when the page loads. Common LCP elements include hero images, featured product images, headline text blocks, and video poster images. The browser determines which element is largest based on its rendered size, not its file size. As the page loads, the LCP element may change until the page is fully rendered.
Egochi, America’s #1 digital marketing agency headquartered in New York City, optimizes Core Web Vitals for clients across industries. From our offices in NYC, Milwaukee, Madison, and Miami, we’ve improved LCP scores for hundreds of websites, resulting in better rankings, lower bounce rates, and increased conversions.
What is a good LCP score?
A good LCP score is 2.5 seconds or less. Google categorizes LCP into three ranges: Good (≤2.5s), Needs Improvement (2.5s-4.0s), and Poor (>4.0s). To pass Core Web Vitals assessment, at least 75% of page visits must have an LCP of 2.5 seconds or less. Faster is always better; top-performing sites often achieve LCP under 1.5 seconds on mobile.
Why is LCP important for SEO?
LCP is important for SEO because it’s one of three Core Web Vitals that Google uses as ranking factors. Since the Page Experience update in 2021, LCP directly affects where your pages rank in search results. Beyond rankings, poor LCP hurts user experience: pages that take over 3 seconds to show main content see 53% of visitors leave. Better LCP means better rankings and more engaged visitors. Learn more in our guide on how to rank higher on Google.
How is LCP different from other loading metrics?
LCP differs from other metrics by measuring when the largest visible content renders, not just when something appears. First Contentful Paint (FCP) measures when any content first appears, which could be a loading spinner. Time to First Byte (TTFB) measures server response time before any rendering. LCP captures what users actually care about: when can they see and use the main content. It’s more user-centric than technical metrics.
Table of Contents
LCP Score Thresholds
Google defines three performance ranges for LCP:
Largest Contentful Paint Scoring
LCP in Core Web Vitals
LCP is one of three Core Web Vitals metrics that Google uses to measure page experience:
The Three Core Web Vitals
LCP measures loading performance, INP (which replaced First Input Delay in 2024) measures interactivity, and CLS measures visual stability. All three must score “Good” on at least 75% of page visits to pass Core Web Vitals assessment.
What Elements Can Be the LCP?
The LCP element is the largest visible content in the viewport. These element types are considered:
Images
The most common LCP element. Includes <img> elements, <image> inside SVG, and images loaded via CSS background-image. Hero images and featured images are typical LCP candidates.
Video Poster Images
The poster frame of a <video> element counts as LCP content. The actual video playback doesn’t affect LCP; only the initial poster image matters.
Text Blocks
Block-level text elements containing text nodes: headings, paragraphs, lists, etc. Large headline text can be the LCP element if no larger image exists above the fold.
Background Images
CSS background images on block elements are measured by the element’s rendered size. Large hero backgrounds are common LCP elements on marketing pages.
To identify your LCP element, use Chrome DevTools: open Performance panel, record a page load, then look for “LCP” in the timings row. Click it to highlight the exact element. You can also use PageSpeed Insights which shows the LCP element in its diagnostics.
Common Causes of Poor LCP
These issues most frequently cause slow LCP scores:
Slow Server Response Time (TTFB)
If your server takes too long to respond, everything else is delayed. Poor hosting, unoptimized databases, and lack of caching all contribute. Aim for TTFB under 800ms; under 200ms is ideal.
Render-Blocking JavaScript and CSS
The browser can’t render content until it downloads and processes render-blocking resources. Large CSS files, JavaScript in the head, and third-party scripts delay LCP significantly.
Slow Resource Load Times
Large, unoptimized images are the most common LCP problem. Images that aren’t compressed, use old formats, or lack proper dimensions take longer to load and render.
Client-Side Rendering
JavaScript frameworks that render content on the client (React, Vue, Angular) can delay LCP because content isn’t visible until JavaScript executes. Server-side rendering or static generation helps.
How to Improve LCP Score
Apply these optimizations to achieve faster LCP:
Optimize and Compress Images
Use WebP or AVIF formats. Compress images without visible quality loss. Serve appropriately sized images for each device using srcset.
Preload the LCP Image
Add <link rel="preload"> for your LCP image so the browser fetches it immediately instead of discovering it later during parsing.
Use a Content Delivery Network (CDN)
Serve images and static assets from servers geographically close to users. CDNs reduce latency and improve load times globally.
Remove Render-Blocking Resources
Inline critical CSS, defer non-critical CSS, and add async/defer to JavaScript. This lets the browser render content faster.
Improve Server Response Time
Upgrade hosting, enable server-side caching, optimize database queries, and use application caching to reduce TTFB.
Don’t Lazy Load the LCP Element
Lazy loading is great for below-fold images but delays LCP if applied to the hero image. Exclude your LCP element from lazy loading.
Minify CSS and JavaScript
Remove whitespace, comments, and unused code. Smaller files download faster. Use build tools to automate minification.
Set Image Dimensions
Always include width and height attributes on images. This prevents layout shifts and helps the browser allocate space before the image loads.
LCP Optimization Code Examples
Preload LCP Image
Add this to your <head> to prioritize your hero image:
<!-- Preload the LCP image -->
<link rel="preload"
as="image"
href="/images/hero.webp"
fetchpriority="high">
Responsive Images with srcset
Serve appropriately sized images for each device:
<img src="/images/hero-800.webp"
srcset="/images/hero-400.webp 400w,
/images/hero-800.webp 800w,
/images/hero-1200.webp 1200w"
sizes="(max-width: 600px) 400px,
(max-width: 1000px) 800px,
1200px"
width="1200"
height="600"
alt="Hero image description"
fetchpriority="high">
Defer Non-Critical JavaScript
<!-- Defer non-critical scripts -->
<script src="/js/analytics.js" defer></script>
<script src="/js/chat-widget.js" defer></script>
<!-- Or load asynchronously -->
<script src="/js/non-critical.js" async></script>
Don’t Lazy Load Your LCP Image
A common mistake is applying loading="lazy" to hero images. Lazy loading delays image loading until it enters the viewport, which is counterproductive for images already visible on page load. Only use lazy loading for below-the-fold images.
LCP Optimization Checklist
- ✓ Hero/LCP image is compressed and uses WebP or AVIF format
- ✓ LCP image has preload hint in <head>
- ✓ LCP image is NOT lazy loaded
- ✓ Images have explicit width and height attributes
- ✓ Non-critical CSS is deferred or loaded async
- ✓ JavaScript is deferred or loaded async
- ✓ Static assets served via CDN
- ✓ Server response time (TTFB) is under 800ms
- ✓ CSS and JavaScript are minified
- ✓ Browser caching is enabled for static assets
Tools to Measure LCP
Use these tools to test and monitor your LCP scores:
PageSpeed Insights
Lab + field data from Google
Google Search Console
Core Web Vitals report
Chrome DevTools
Performance panel + Lighthouse
WebPageTest
Detailed waterfall analysis
GTmetrix
Performance reports + history
Lighthouse
Built into Chrome DevTools
CrUX Dashboard
Real user data over time
Web Vitals Extension
Chrome extension for quick checks
For more performance tools, see our technical SEO tools guide.
| Tool | Data Type | Best For |
|---|---|---|
| PageSpeed Insights | Lab + Field | Quick checks with real user data |
| Search Console | Field (CrUX) | Site-wide Core Web Vitals monitoring |
| Chrome DevTools | Lab | Debugging and identifying LCP element |
| WebPageTest | Lab | Detailed waterfall and filmstrip analysis |
| Lighthouse | Lab | Automated audits with recommendations |
Lab data (Lighthouse, DevTools) tests under controlled conditions and is useful for debugging. Field data (CrUX, Search Console) shows real user experience and is what Google uses for rankings. Prioritize fixing issues that appear in field data since that affects your actual users and SEO.
People Also Ask About LCP
What causes high LCP?
High LCP is most commonly caused by large, unoptimized images, slow server response times, render-blocking JavaScript/CSS, and client-side rendering. Images are the #1 culprit; large hero images without compression or modern formats often push LCP above 4 seconds. Slow hosting and excessive third-party scripts also significantly impact LCP.
What is LCP vs FCP?
LCP measures when the largest visible content renders; FCP measures when any content first appears. First Contentful Paint (FCP) could be triggered by a loading spinner or navigation bar. LCP waits for the main content users actually want to see. LCP is a Core Web Vital and ranking factor; FCP is not.
How do I find my LCP element?
Use Chrome DevTools Performance panel or PageSpeed Insights. In DevTools, record a page load, then look for “LCP” in the Timings row and click it to highlight the element. PageSpeed Insights shows the LCP element in the Diagnostics section. You can also use the Web Vitals Chrome extension for quick identification.
Does LCP affect mobile and desktop rankings separately?
Yes, Google evaluates mobile and desktop Core Web Vitals separately. Mobile rankings use mobile LCP scores; desktop rankings use desktop LCP scores. Since most users are on mobile and mobile typically has slower connections, mobile LCP is often worse and should be prioritized.
Can text be the LCP element?
Yes, text blocks can be the LCP element if they’re the largest visible content. Block-level elements containing text nodes (headings, paragraphs) are measured. If your page has a large headline with no hero image, the headline text could be your LCP element. Font loading can delay text LCP.
Core Web Vitals Optimization from Egochi
Egochi, America’s #1 digital marketing agency headquartered in New York City, optimizes LCP and all Core Web Vitals as part of our complete technical SEO services.
In-Depth Audits: Our SEO audits analyze LCP for all key pages, identify the specific elements and issues causing slow scores, and prioritize fixes based on impact and effort.
Image Optimization: We implement complete image SEO including compression, modern formats (WebP/AVIF), responsive images, and proper preloading to dramatically improve LCP scores.
Performance Implementation: Our developers implement LCP fixes including CDN setup, render-blocking resource optimization, server-side rendering, and caching strategies that achieve sub-2.5s LCP scores.
Proven Results: From our offices in NYC, Milwaukee, Madison, and Miami, we’ve helped clients reduce LCP from 5+ seconds to under 2 seconds, resulting in improved rankings, lower bounce rates, and higher conversion rates.
Need Help Improving Your LCP Score?
Get a free Core Web Vitals audit from Egochi. We’ll analyze your LCP and show you exactly how to fix it.
Get a Free Technical AuditOr call (888) 644-7795
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