At a glance the headline numbers for Largest single shift
The single largest layout-shift score captured.
The largest single layout shift on the typical site scores 0.
Distribution & median LCP site count and median LCP at each level of largest single shift
Passing LCP by largest single shift which level passes the LCP most often
Largest single shift 0.0. p75 0.1. p99 1.0. At the low end (0–0): LCP 1.6s. At the high end (1+): LCP 1.8s. computed
Why this matters for the Core Web Vitals, and where to start fixing it
A layout shift score multiplies how much of the viewport moved by how far it moved. One full-width block jumping down can fail the CLS threshold on its own. The largest single shift tells you whether a site has that one dominant event or death by a thousand small ones.
If the largest shift carries most of the total, the work is finding one element. The usual suspects: a hero image without dimensions, a banner injected above the content, a font swap that reflows the page. Reserve the space that element needs and the problem is gone.
Chrome field data from 189,915 sites, representing millions of real page loads. How we measured.