What is Core Web Vitals?
Turkish: Core Web Vitals
Core Web Vitals are Google's field metrics for web experience, measuring loading speed, responsiveness, and visual stability.
What are Core Web Vitals?
Core Web Vitals are the three performance metrics Google highlights to understand real user experience on web pages. They measure how fast the main content appears, how quickly the page responds to interaction, and how visually stable the page remains while loading.
The Metrics
- LCP (Largest Contentful Paint): Measures when the main content becomes visible. A good threshold is 2.5 seconds or less.
- INP (Interaction to Next Paint): Measures responsiveness to user interactions. A good threshold is 200 ms or less.
- CLS (Cumulative Layout Shift): Measures unexpected layout movement. A good threshold is 0.1 or less.
These metrics are not just one lab test. Google evaluates field data at the 75th percentile, meaning the experience should be acceptable for most users across real devices and network conditions.
How Are They Measured?
PageSpeed Insights, the Chrome User Experience Report, Search Console, and real user monitoring tools can report Core Web Vitals data. Lighthouse is useful during development, but live user data is more important for metrics such as INP.
SEO and Business Impact
Core Web Vitals are part of page experience signals in SEO, not a standalone ranking guarantee. Still, slow LCP, delayed button response, or shifting form fields can affect conversions, ad efficiency, and user trust.
In technical SEO work, image optimization, critical CSS, font loading, JavaScript reduction, and third-party script management directly affect these metrics.
Related Terms
CLS measures how much unexpected layout movement disrupts visual stability while a page loads, as part of Core Web Vitals.
Image OptimizationImage optimization makes pages load faster through correct sizing, modern formats, compression, responsive delivery, and loading strategy.
INP (Interaction to Next Paint)INP measures the time from user clicks, taps, or keyboard interactions until the page can show the next visual response.
Lazy LoadingLazy loading delays images, videos, or components until they are needed, reducing initial load time and bandwidth use.
LCP (Largest Contentful Paint)LCP is a Core Web Vitals metric measuring the time for the largest visible content element to appear; under 2.5s is considered good.
PageSpeed InsightsPageSpeed Insights is Google's free tool for measuring web page performance on mobile and desktop based on Core Web Vitals.
Performance BudgetA performance budget sets measurable limits for a web page, such as file size, request count, and loading time, before regressions ship.
SEO (Search Engine Optimization)SEO improves how search engines crawl, understand, and rank a site so it can appear for relevant searches without paid ads.
Technical SEOTechnical SEO improves site infrastructure so search engines can crawl, render, index, and evaluate pages quickly and reliably.
TTFB (Time to First Byte)TTFB measures the time from sending a browser request to receiving the first response byte, exposing server and network delay.
Web VitalsWeb Vitals are Google's metrics for monitoring page experience through loading speed, interaction latency, and visual stability.