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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 a free AI Search Readiness Audit

The audit goes beyond PageSpeed — it covers schema markup, llms.txt, robots.txt for AI crawlers, JS rendering, SSR vs CSR, structured data coverage, and how ChatGPT / Claude / Perplexity actually cite your business compared to competitors. 48-hour turnaround. No signup. No sales pitch.

Request your free audit →

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 a free AI Search Readiness Audit that covers performance alongside your other AI-visibility signals.

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