Core Web Vitals/Diagnosis
03 / 19 · Core Web Vitals

Diagnosis

Why a page fails, how to debug it

Load phasesHotspots3Trend
2.50s budget
Connection350ms
Server950ms
Until first paint1.30s
First paint → LCP1.70s
!

40% of LCP happens after first paint. The LCP element is discovered or rendered late, so this is a frontend problem.

  • Interaction timing for INP and shift patterns for CLS