LCP
Largest Contentful Paint
How long the largest visible element takes to render. Good is 2.5 seconds or less.
Good ≤ 2.5 s
Read moreWebsite performance, explained properly
Faster websites, better Core Web Vitals, clearer technical SEO
Practical guides and free tools for measuring and improving Largest Contentful Paint, Interaction to Next Paint, Cumulative Layout Shift and everything behind them.
Featured tool
Core Web Vitals checker: interpret your LCP, INP and CLS
Classify values you have already measured, with the source and units kept clear.
Open toolThe three Core Web Vitals
Google evaluates these three metrics for real users at the 75th percentile. Each one has a documented threshold for a good experience.
Featured guides
All guides
Core Web Vitals for beginners: measure and improve LCP, INP and CLS
Start with the experience your visitors have, then use the right measurement to decide what to fix.
How to reduce server response time: diagnose and improve TTFB
Separate connection delays from application work before changing hosting, caching or delivery settings.
How to improve Largest Contentful Paint by fixing the slowest LCP stage
The largest image is not always the problem; the delay before it starts loading can matter more.
Latest articles
All guides
JavaScript SEO: how Google renders pages and how to keep important content indexable
Verify the content Google can retrieve instead of assuming that a working browser session proves indexability.
Technical SEO fundamentals: make the right pages crawlable, indexable and connected
Build an accessible route from discovery to useful content, then verify what Google actually processed.
Improve Core Web Vitals in Next.js with better rendering, images and hydration
Choose what the server sends, what the browser executes and what your measurement actually represents.
Shopify speed optimization: improve the storefront work you control
Start with the shopping journey and the resources your theme actually requests.
WordPress Core Web Vitals: optimize hosting, themes, plugins and WooCommerce
Match each fix to the template, visitor state and performance stage that actually needs it.
Third-party scripts: measure their cost and load them only when needed
A smaller script loader is not the same as a cheaper feature; measure the whole interaction.
Browse by topic
Core Web Vitals
LCP, INP and CLS explained and fixed.
Page Speed Optimization
Images, JavaScript, CSS, fonts and caching.
Server & Hosting Performance
TTFB, caching layers, CDNs and HTTP.
Technical SEO
Crawling, indexing, rendering and rankings.
Platform Optimization
WordPress, WooCommerce, Shopify, Next.js and React.
Platform guides
View allImprove Core Web Vitals in Next.js with better rendering, images and hydration
Choose what the server sends, what the browser executes and what your measurement actually represents.
Shopify speed optimization: improve the storefront work you control
Start with the shopping journey and the resources your theme actually requests.
WordPress Core Web Vitals: optimize hosting, themes, plugins and WooCommerce
Match each fix to the template, visitor state and performance stage that actually needs it.
Free performance tools
No accounts, no tracking of what you type. Everything runs in your browser unless a tool says otherwise.
Core Web Vitals checker: interpret your LCP, INP and CLS
Check measured values against Core Web Vitals thresholds.
Website performance checklist: plan and track your fixes
Track practical performance checks across your website.
Image savings calculator: compare bytes before and after optimization
Compare image sizes and estimate transfer savings.
Core Web Vitals thresholds: LCP, INP and CLS reference
Compare LCP, INP and CLS threshold ranges.
PageSpeed Insights analyzer: interpret public-page performance
Review PageSpeed lab results and available field data.
Popular resources
- Core Web VitalsCore Web Vitals for beginners: measure and improve LCP, INP and CLS
- Core Web VitalsHow to improve Largest Contentful Paint by fixing the slowest LCP stage
- Core Web VitalsHow to improve Interaction to Next Paint: diagnose input, processing and rendering delays
- Page Speed OptimizationHow to read a PageSpeed Insights report and choose the next fix
- Platform OptimizationWordPress Core Web Vitals: optimize hosting, themes, plugins and WooCommerce
- Server & Hosting PerformanceHow to reduce server response time: diagnose and improve TTFB
Partner content
Articles about companies and services in website performance, published separately from our editorial guides.
Page speed: fix it yourself or bring in a specialist?
Separate safe owner-led fixes from work that needs technical diagnosis, then give a specialist a clear brief and check the result.
How website owners can keep up with performance and search changes
A practical routine for deciding which performance and search updates deserve action, using official sources, site data and checks after deployment.
Publishing AI-assisted articles: a page speed and indexing checklist
A practical publishing checklist for AI-assisted articles, from responsive images and clean markup to indexing settings and evidence-based editorial review.