PERFORMANCE · SEO GLOSSARY
Page Speed
The time it takes for a page to load and become usable — measured by multiple metrics including TTFB, FCP, and Core Web Vitals.
Definition
Page speed is a broad term covering how fast a page loads and becomes interactive. Key metrics include Time to First Byte (TTFB — how fast the server responds), First Contentful Paint (FCP — when the first content appears), Largest Contentful Paint (LCP — when the main content is visible), and Interaction to Next Paint (INP — how quickly the page responds to user input). Google measures page speed for ranking purposes primarily via Core Web Vitals from real Chrome user data.
Why it matters for SEO
Speed is a user experience metric that directly impacts conversion rates and bounce rates. Studies consistently show that a 1-second delay in page load reduces conversions by 7–15% and increases bounce rates significantly. For ranking, Google has used page speed as a signal since 2010, and since 2021 Core Web Vitals (field data) have been a direct ranking factor. Slow pages also consume more crawl budget — Googlebot may crawl fewer pages per visit on slow sites.
How DeepSEOAnalysis checks this
The audit combines CrUX field data (real user measurements) with PageSpeed Insights lab scores for a complete picture. Critical flags are given to pages with LCP > 4s or INP > 500ms from field data. Lab scores help diagnose causes: render-blocking resources, uncompressed images, unused JavaScript, and slow server response times are the most common culprits. TTFB > 800ms is flagged as a performance warning.
Useful tools and resources
GLOSSARY
Related terms
performance
Core Web Vitals
Three Google metrics — LCP, INP, and CLS — that measure real-user loading, interactivity, and visual stability.
Read definition →performance
LCP (Largest Contentful Paint)
The time from page load start until the largest visible content element finishes rendering. Should be under 2.5 seconds.
Read definition →performance
CLS (Cumulative Layout Shift)
A Core Web Vital that measures unexpected visual shifts in page layout during load. Should be 0.1 or lower.
Read definition →See how your site scores on Page Speed.
The free DeepSEOAnalysis audit checks page speed and 100+ other signals. Full report, no signup.
Run a free audit →