Analyze your website performance with a checklist-based audit. Score your site against key performance metrics and get actionable recommendations.
Check each optimization that your site implements.
Estimated Performance Score
Poor
0 of 10 checks passed
Google uses three Core Web Vitals as ranking signals: LCP (Largest Contentful Paint) — how fast the main content loads (target: under 2.5s), FID/INP (First Input Delay / Interaction to Next Paint)— how fast the page responds to user input (target: under 200ms), and CLS (Cumulative Layout Shift)— how much the layout moves during loading (target: under 0.1). Pages passing all three thresholds are 28% more likely to rank in the top 3.
Amazon found that every 100ms of latency costs 1% in sales. Google discovered a 0.5-second delay in search results causes a 20% drop in traffic. Walmart found each 1-second improvement in load time increased conversions by 2%. For a site earning $100,000/day, a 1-second slowdown could cost $2,500/dayor $912,500 per year. Mobile users are even more impatient — 53% abandon sites that take over 3 seconds to load.
Images are the #1 performance problem, accounting for 50–80% of page weight on most sites. Converting from JPEG/PNG to WebP saves 25–35% file size with no visible quality loss. Render-blocking JavaScript is #2: a 500KB JS bundle that blocks rendering can add 2–3 seconds to LCP on mobile. Third-party scripts (analytics, ads, chat widgets) are #3: the average website loads 20+ third-party scripts adding 1–2 seconds to total load time.
Enable Brotli/Gzip compression (saves 70–80% on text resources). Add loading="lazy" to below-fold images. Set long cache headers (1 year) on static assets. Preload your LCP image with <link rel="preload">. Use font-display: swapto prevent invisible text. These five changes alone can improve your Lighthouse score by 20–30 points.
Lighthouse scores 90–100 are “good” (green), 50–89 are “needs improvement” (orange), and 0–49 are “poor” (red). Most websites score between 40–70. Achieving 90+ on mobile is challenging but worthwhile. The median mobile Lighthouse score across the top 1 million websites is approximately 50.
Yes, since 2021 Core Web Vitals are a confirmed ranking factor. However, Google says speed is a tiebreaker, not a dominant factor — a slow page with excellent content can still outrank a fast page with thin content. The practical impact: sites that pass Core Web Vitals see 1–3% improvement in visibility compared to similar sites that fail.
Field data (real user measurements from Chrome UX Report) matters more for rankings. Lab data (Lighthouse, WebPageTest) is useful for debugging but runs in a controlled environment that does not reflect real user conditions (varying devices, networks, locations). Google uses the 75th percentile of field data for Core Web Vitals assessment. Check your field data in Google Search Console's Core Web Vitals report.