The three current metrics
In plain English: LCP measures loading, INP responsiveness and CLS visual stability.
Largest Contentful Paint describes when the main visible content finishes rendering. Interaction to Next Paint measures responsiveness across user interactions. Cumulative Layout Shift measures unexpected visual movement.
FID is no longer the current responsiveness Core Web Vital; current guidance uses INP.
- LCP: main image or heading appears late
- INP: controls respond slowly
- CLS: content jumps after loading
Field data and URL groups
In plain English: Search Console uses anonymised real-user Chrome experience data, not one synthetic test.
The report groups similar URLs and separates mobile from desktop. A group's status is determined by its worst-performing Core Web Vital where sufficient data exists. Low-traffic URLs or groups may not have enough data to appear.
Why tools can disagree
In plain English: Search Console describes a rolling field dataset; Lighthouse runs a controlled lab test.
PageSpeed Insights can show both field and lab information for an individual URL, while Search Console reports grouped field status. Different devices, periods, URL grouping and data availability can produce different-looking results.
Keep in mind: Use lab tools to diagnose repeatable causes, then use field data to confirm real-user improvement over time.
Fix systems, not report rows
In plain English: Shared templates and components often create shared performance problems.
Trace a poor group to common layouts, images, fonts, scripts or interaction code. Validate the fix, monitor field data and prioritise user experience rather than treating Core Web Vitals as the only ranking system.
Google recommends good Core Web Vitals, but passing them alone does not guarantee ranking improvements.