Largest layout shift score and the Core Web Vitals
Among sites with non-zero lab CLS, 35.7% (49,951) keep their largest single shift under 0.01 (85% good field CLS), whereas the 15.2% suffering a single jump over 0.25 drop to 54% good field CLS.
35.7% of sites use a largest shift under 0.01 largest single layout shift score, and 85% of those sites have a good CLS, against 78% of all sites.
CLS pass rate
Sites with a largest shift under 0.01 largest single layout shift score have a good CLS most often: 85%, against 78% of all sites. Sites with a largest shift over 0.25 largest shift have it least often, at 54%.
Largest single layout shift score usage
A largest shift under 0.01 is the most used: 35.7% of sites.
Understanding largest single layout shift score
When a single layout jump blows the entire 0.10 CLS budget
Google's Good CLS threshold is 0.10. Across 49,951 shifting sites (35.7%) whose largest single shift stays below 0.01, 85% pass field CLS, and across 47,232 sites (33.8%) at 0.01 to 0.10, 79% pass. Once a single jump lands between 0.10 and 0.25 (15.3%), good field CLS drops to 67%, and when a single shift exceeds 0.25 (15.2%, 21,254 sites), only 54% pass field CLS.
Cap your largest single layout shift below 0.01 by reserving exact aspect-ratio boxes for hero images and rendering top promo or consent banners in fixed or server-allocated slots. Across all shifting sites, 35.7% stay under 0.01 (85% good CLS) and 15.2% exceed 0.25 (54% good CLS).
How largest single layout shift score plays out per platform
What the field data shows when you isolate a single CMS or framework.
WordPress 48,578 sites Shifting WordPress sites with a largest shift over 0.25 (12.5%) pass field CLS at 52% vs 86% under 0.01 (34 points apart).
Across 48,578 WordPress sites with non-zero lab CLS, 37.9% have a largest shift under 0.01 (86% good CLS), 35.3% sit at 0.01 to 0.10 (78%), 14.3% sit at 0.10 to 0.25 (66%), and 12.5% exceed 0.25 (52% good CLS).
Shopify 5,684 stores Shifting Shopify stores with a largest shift over 0.25 (12.2%) pass field CLS at 65% vs 90% under 0.01.
Across 5,684 shifting Shopify storefronts, 37.3% have a largest shift under 0.01 (90% good CLS), 37.6% sit at 0.01 to 0.10 (85%), and 12.2% exceed 0.25 (65% good CLS).
React & Next.js 4,093 sites Shifting React & Next.js sites with a largest shift over 0.25 (14.8%) pass field CLS at 51% vs 85% under 0.01 (34 points apart).
Across 4,093 shifting React sites, 36.7% have a largest shift under 0.01 (85% good CLS) and 14.8% exceed 0.25 (51% good CLS).
By Arjen Karel · 210,902 crawled sites (69,745 with desktop Chrome field data, 139,880 sites with largest single layout shift score, October 2026). How we measured.