Lighthouse
Google’s automated tool for improving the quality of web pages. Audits performance, accessibility, SEO, and more.
Explore Page-Speed Analysis
& Loading Optimization
Discover powerful tools and resources to measure, analyze, and dramatically improve your website’s performance, load times, and Core Web Vitals.
2.5s
Avg. Load Time Goal
90+
Lighthouse Score
40%
Faster Conversions
3
Core Web Vitals
Performance Tools
Industry-leading tools for page-speed analysis, diagnostics, and continuous optimization.
PageSpeed Insights
Combines lab and field data to give you a complete picture of how real users experience your site.
WebPageTest
Deep-dive performance testing from multiple locations and devices with filmstrip views and waterfalls.
GTmetrix
Easy-to-understand performance reports powered by Lighthouse and proprietary metrics.
Chrome UX Report
Real-user experience data (CrUX) for Core Web Vitals across millions of websites.
DebugBear & SpeedCurve
Continuous monitoring, budgets, and competitive benchmarking for performance teams.
Core Web Vitals & Key Metrics
These metrics define how users perceive the speed and responsiveness of your website.
Largest Contentful Paint (LCP)
Loading performance — when the main content becomes visible
≤ 2.5s
Interaction to Next Paint (INP)
Responsiveness — how quickly the page reacts to user input
≤ 200ms
Cumulative Layout Shift (CLS)
Visual stability — how much the page jumps while loading
≤ 0.1
First Contentful Paint (FCP)
Time until the first text or image is painted
≤ 1.8s
Time to First Byte (TTFB)
Server responsiveness and network latency
≤ 800ms
Loading Optimization Strategies
Practical techniques that deliver the biggest gains in real-world performance.
Image Optimization
Use modern formats (WebP/AVIF), responsive images, lazy loading, and proper sizing to cut bytes dramatically.
Code Splitting & Tree Shaking
Ship only the JavaScript needed for the current page. Remove unused code and defer non-critical scripts.
Critical CSS & Preload
Inline critical CSS, preload key fonts and assets, and use resource hints (preconnect, prefetch).
CDN & Edge Caching
Serve static assets from a global CDN and enable long-lived caching with proper cache-control headers.
Server & Backend Tuning
Improve TTFB with faster hosting, HTTP/2 or HTTP/3, compression (Brotli), and efficient database queries.
Mobile-First Performance
Test on real mid-range devices. Prioritize mobile experience — most traffic and Core Web Vitals are mobile.
Resources for Improving Website Performance
Curated guides, documentation, and communities to level up your performance skills.
web.dev
Google’s official learning hub for modern web performance, Core Web Vitals, and best practices.
MDN Web Docs
In-depth documentation on performance APIs, Resource Timing, Navigation Timing, and more.
Chrome Developers
Deep technical articles, case studies, and tooling updates from the Chrome team.
Ready to speed up your website?
Start measuring today. Run a free analysis and discover exactly what is slowing your pages down.