What is Page Speed?
How fast a page becomes usable, measured by field metrics like LCP and INP rather than single lab scores. Small gains compound commercially: a tenth of a second has moved retail conversions measurably.
Related terms
Core Web Vitals
Google’s field-measured experience metrics: Largest Contentful Paint, Interaction to Next Paint, and Cumulative Layout Shift. Roughly half of origins pass all three, so the work remains relevant.
Largest Contentful Paint (LCP)
The Core Web Vital measuring when the main content element finishes rendering, ideally under 2.5 seconds. Hero images, web fonts, and slow server responses are the usual culprits.
Time to First Byte (TTFB)
Milliseconds until the server responds. High TTFB delays everything downstream including LCP, and usually points at hosting, edge caching, or server-render cost.
Technical SEO
The crawling, indexing, rendering, and performance work that lets search engines reach, understand, and serve your pages. It covers directives, architecture, speed, and structured data rather than words on the page.
Crawling
How search-engine bots discover pages by following links, sitemaps, and directives. If a URL is never crawled, it cannot be indexed no matter how good its content is.
Crawl Budget
The number of pages a search engine will crawl on a site in a given period, driven by server capacity and demand signals. Large or slow sites must spend it on indexable, valuable URLs.