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Core Web Vitals & PageSpeed Calculator

Test your mobile + desktop PageSpeed Insights scores, and see what a slow LCP is costing you in conversions. Most page-speed tools stop at the score. This one translates the score into projected revenue loss using Google's published conversion-vs-speed research.

Runs Google PageSpeed Insights on mobile + desktop in parallel. Each scan takes 10–30s. Field data (real-user metrics) shows when Google has enough Chrome User Experience data for the URL.

Optional. Used to translate the speed-driven conversion loss into estimated $/year. Without it, we show the % conversion impact and a $500K/yr illustrative figure.

Why this matters for AI search

Speed isn't just about human conversions. AI crawlers (GPTBot, ClaudeBot, PerplexityBot) operate on tight time budgets and skip slow pages. Google's AI Overviews uses real-user Core Web Vitals as an input signal for extraction eligibility. A 4-second LCP doesn't just cost you mobile customers; it gets you skipped when an AI assistant decides which page to cite. The revenue math here is the human side of the same speed problem.
Page speed is one input. AI search readiness is the whole picture.

Get the full AI Visibility Audit

The audit goes beyond PageSpeed. It covers schema markup, llms.txt, robots.txt for AI crawlers, JS rendering, SSR vs CSR and structured data coverage — every reason an assistant might skip you.

The free score takes seconds and puts one real buyer question to ChatGPT, Claude, Gemini, and Perplexity so you see whether you get named. The full audit is $49, one-time, and adds five queries, the competitors named in your place, the sources behind those answers, and every fix paste-ready.

Start with your free score →

FAQ

Frequently asked questions

PageSpeed Insights scores run 0–100. 90+ is good (green), 50–89 needs improvement, and below 50 is poor. Mobile scores are typically lower than desktop and matter more, since Google uses mobile-first indexing and most traffic is mobile. The calculator above tests both.

Core Web Vitals are Google's three user-experience metrics. LCP (Largest Contentful Paint) measures loading. Aim for under 2.5s. INP (Interaction to Next Paint) measures responsiveness. Aim for under 200ms. CLS (Cumulative Layout Shift) measures visual stability. Aim for under 0.1.

Yes. Core Web Vitals are a confirmed Google ranking signal, and a slow, heavy page is also harder for AI crawlers to fetch and parse cleanly. Speed alone won't get you cited, but a fast, server-rendered page removes a common reason search engines and AI assistants skip your content.

Google's research consistently links slower load times to lower conversion rates: every extra second of delay measurably reduces the share of visitors who complete an action. The calculator translates your LCP into a projected annual revenue impact so the cost of a slow page is concrete, not abstract.

Common wins: serve properly sized, modern-format images; reduce render-blocking JavaScript; and use server-side rendering instead of client-side. If your site runs on a heavy page builder or unoptimized WordPress theme, a modern rebuild is one option, or get the AI Visibility Audit that covers performance alongside your other AI-visibility signals.

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