Core Web Vitals
Core Web Vitals are three Google metrics that measure a page's loading speed, responsiveness, and visual stability.
The three metrics are LCP (time to display the main content), INP (response delay to interactions), and CLS (visual shifts during loading). Each one has a numeric threshold to meet.
These metrics are part of Google's ranking criteria and shape the real experience of visitors. A slow or unstable site loses clients before the message is even read.