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Performance · Free Tool

Free LCP Checker

LCP (Largest Contentful Paint) measures how quickly the main content of your page appears. Google's threshold for "Good" is under 2.5 seconds. This tool measures your LCP, identifies exactly which element is causing it (hero image, H1, video), and gives you targeted recommendations to improve it.

scheduleSpeed tests typically take 15–30 seconds.

What This Tool Checks

  • check_circleLCP time in seconds with Good/Needs Improvement/Poor verdict
  • check_circleLCP element identification: hero image, H1, background image, or video
  • check_circleLCP breakdown: TTFB + resource load delay + render delay
  • check_circleRender-blocking resource detection affecting LCP
  • check_circleImage optimization opportunities (uncompressed, no WebP)
  • check_circlePreload LCP image recommendation when applicable
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Why This Matters for SEO

LCP is the Core Web Vital with the biggest impact on user perception of speed. It measures when the main content is visible — usually the hero image or headline. Google's threshold for "Good" is under 2.5 seconds. Pages with LCP over 4 seconds receive a "Poor" rating that directly affects rankings. LCP is the most commonly failing Core Web Vital for real-world websites.

Want this audit running on every page of your site, every day? See PerfBee Performance Boost — Continuous Core Web Vitals monitoring with deploy comparisons and AI fix suggestions.

Frequently Asked Questions

What is Largest Contentful Paint (LCP)?expand_more
Largest Contentful Paint (LCP) is a Core Web Vital that measures when the largest visible content element finishes loading in the viewport. This is usually a hero image, product photo, H1 heading, or video thumbnail. LCP represents perceived load speed from the user's perspective — it's when the "main content" appears. Google's "Good" threshold is under 2.5 seconds.
What causes a slow LCP?expand_more
The four sub-causes of slow LCP are: (1) Slow TTFB (server response time) — if your server is slow, nothing loads fast. (2) Resource load delay — the LCP element isn't being fetched early enough (no preload). (3) Resource load time — large images or slow CDN. (4) Element render delay — heavy JavaScript blocking rendering before the LCP element can paint. The most common fix is optimizing hero images and adding <link rel="preload">.
How do I improve LCP?expand_more
Top LCP improvements: (1) Optimize your LCP image — compress with WebP, reduce dimensions to the displayed size. (2) Preload the LCP image with <link rel="preload" as="image"> in your <head>. (3) Improve server TTFB (use a CDN, enable caching). (4) Remove render-blocking CSS/JS that delays the browser from painting. (5) Use fetchpriority="high" on the LCP image element. A 2.5-second LCP is achievable for most sites.
What is the LCP Good threshold?expand_more
Google's LCP thresholds are: Good = under 2.5 seconds, Needs Improvement = 2.5–4 seconds, Poor = over 4 seconds. Google measures this at the 75th percentile of real user visits — meaning 75% of your visitors must experience LCP under 2.5 seconds for the page to pass. Lab tools like Lighthouse can approximate this, but Google Search Console shows real user data (field data).
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Track LCP across all your pages

A slow LCP on your homepage is easy to spot — but what about your 500 product pages? PerfBee audits LCP across every page and tracks it after each deploy. Get daily crawl reports, broken link alerts, Core Web Vitals tracking, and AI fix suggestions — across your entire site.

  • checkCrawl unlimited pages — daily, automatic
  • checkBroken link detection across your whole site
  • checkCore Web Vitals & Lighthouse audits per page
  • checkAI-powered code fix suggestions
  • checkWhite-label PDF reports for clients
  • checkEmail alerts for new issues & downtime
Monitor LCP Site-Widearrow_forwardView Pricing

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