Feedback

Web Performance Blog

Analyses from PerfDelta’s measurement data, new features and changes in Core Web Vitals, Lighthouse and Chrome. Clearly explained, backed by numbers and with what it means for your website.

RSS feed

Data analysis · October 26, 2026 · 5 min read

Slow LCP: Load Delay and Server Response Cause 9 in 10 Cases

Field data from 2,600 websites shows that most of a slow LCP is lost before the image even starts loading. Late image discovery and slow server responses are the main causes.