CLS shift concentration on Wix sites
Among sites recording lab layout shifts, 72.9% (746) concentrate 95% or more of their CLS into a single shift (97% good field CLS), while 14.5% suffer multiple compounding shifts (94% good field CLS).
72.9% of Wix sites use a single dominant shift CLS shift concentration, and 97% of those sites have a good CLS, against 96% of all Wix sites.
CLS pass rate
Sites with a single dominant shift CLS shift concentration have a good CLS most often: 97%, against 96% of all Wix sites.
CLS shift concentration usage
A single dominant shift is the most used: 72.9% of Wix sites.
CLS shift concentration per framework
React sets the CLS shift concentration to a single dominant shift on 73% of its sites, and 96% of React sites have a good CLS, against 96% of all sites.
React 1,023 sitesSingle dominant shift (95%+) 73%Multiple compounding shifts (<65%) 14%Mostly one shift (65-94%) 13%96%CLS shift concentration or the framework
One isolated layout jump versus cascading multi-element shifts
CLS concentration measures the ratio of the single largest layout shift to total lab CLS on pages with non-zero shift. Across 746 sites (72.9%) where one isolated element accounts for at least 95% of total CLS, 97% pass field CLS. When secondary shifts join in (12.7% at 65% to 94% concentration), good field CLS drops to 92%, and when shifts are spread across multiple compounding events (14.5%, 148 sites), good field CLS falls to 94%.
Understanding CLS shift concentration
Inspect every LayoutShift entry in your performance trace: if concentration is 95%+, fixing the single culprit container resolves CLS; if concentration is below 65%, audit header bars, web fonts, and unsized media together. Across all audited sites with lab shifts, 72.9% have a single dominant shift (97% good CLS) and 14.5% have multiple compounding shifts (94% good CLS).
By Arjen Karel · 5,621 crawled Wix sites (728 with desktop Chrome field data, 1,024 sites with CLS shift concentration, October 2026). How we measured.