Test Core Web Vitals (LCP, CLS, FID), get your performance score, and find exactly what's slowing your site down. Real Google data. Mobile & desktop.
Page speed is how fast your page loads and becomes interactive. Google made it a ranking factor in 2010 for desktop, 2018 for mobile. Since 2021, Core Web Vitals (LCP, CLS, FID) are direct ranking signals. Slow pages increase bounce rate, hurt crawl efficiency, and signal poor UX — all of which hurt rankings.
Core Web Vitals are three Google metrics: LCP (Largest Contentful Paint) — main content load time, good if under 2.5s. CLS (Cumulative Layout Shift) — visual stability, good if under 0.1. FID/INP (interactivity) — response time, good if under 200ms. Pages passing all three get a page experience ranking boost.
90-100 is Good (green), 50-89 Needs Improvement (orange), 0-49 Poor (red). Target 90+ on desktop and 70+ on mobile. Mobile scores are typically 20-40 points lower. Focus on passing Core Web Vitals first — those directly impact rankings.
Unoptimized images (use WebP/AVIF), render-blocking JS/CSS, too many third-party scripts, no browser caching, slow server/TTFB, large JavaScript bundles (common in React/Next.js), and no lazy loading on below-fold images. Most sites gain 20-40 points by fixing images alone.
For LCP: preload hero image, use CDN, switch to WebP. For CLS: set explicit width/height on images/videos, avoid injecting content above existing content. For FID/INP: defer non-critical JS, break up long tasks. For all: compress responses (brotli/gzip), use a CDN, enable browser caching.
Yes — since July 2019, Google uses mobile-first indexing. Your mobile page speed affects rankings more than desktop. Core Web Vitals thresholds are applied to real user field data (not just lab tests), so actual mobile network performance matters. Closing the mobile-desktop performance gap is one of the highest-ROI SEO improvements available.