Advanced – Non-Functional Testing
Core Web Vitals – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
Google’s set of user-experience performance metrics — LCP, INP (formerly FID), and CLS — used to measure page quality.
In simple words
Google’s three metrics for real user page experience: LCP, INP, CLS.
Exam tip
Core Web Vitals are ranking factors in Google search and standard front-end performance targets.
Related terms
- Largest Contentful Paint (LCP)How fast the biggest thing on the page finishes loading.
- Cumulative Layout Shift (CLS)How much the page jumps around while loading.
- Interaction to Next Paint (INP)How quickly the page responds to user clicks and taps — replaces FID.
- LighthouseGoogle’s built-in tool that grades a page on perf, a11y, and SEO.
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