WordPress largest layout shift score and the Core Web Vitals

Sites with a largest shift under 0.01 largest single layout shift score have a good CLS most often: 86%, against 78% of all WordPress sites. Sites with a largest shift over 0.25 largest shift have it least often, at 52%.

A largest shift under 0.01 is the most used: 37.8% of WordPress sites.

On jQuery, 38% of sites use a largest shift under 0.01 largest single layout shift score, and 77% of jQuery sites have a good CLS, against 78% of all sites. On Vue, 38% of sites use a largest shift under 0.01, and 75% of Vue sites have a good CLS.

FrameworkLargest single layout shift score on its sitesGood CLS

WordPress sites with largest single layout shift score 46,976 sitesUnder 0.01 (Imperceptible) 38%0.01 to 0.10 (Within Good budget) 35%0.10 to 0.25 (Needs Improvement) 14%Over 0.25 (Poor in one jump) 13%78%

jQuery 45,155 sitesUnder 0.01 (Imperceptible) 38%0.01 to 0.10 (Within Good budget) 35%0.10 to 0.25 (Needs Improvement) 15%Over 0.25 (Poor in one jump) 13%77%

React 1,715 sites0.01 to 0.10 (Within Good budget) 37%Under 0.01 (Imperceptible) 35%0.10 to 0.25 (Needs Improvement) 14%Over 0.25 (Poor in one jump) 14%75%

Vue 3,799 sitesUnder 0.01 (Imperceptible) 38%0.01 to 0.10 (Within Good budget) 33%0.10 to 0.25 (Needs Improvement) 15%Over 0.25 (Poor in one jump) 14%75%

Under 0.01 (Imperceptible) 0.01 to 0.10 (Within Good budget) 0.10 to 0.25 (Needs Improvement) Over 0.25 (Poor in one jump)

Does the framework explain the largest single layout shift score difference?

On jQuery, 85% of sites with a largest shift under 0.01 largest single layout shift score have a good CLS, against 78% of jQuery sites with a largest shift of 0.01 to 0.10. Within jQuery, sites with a largest shift under 0.01 have a good CLS more often. On Vue, 84% of sites with a largest shift under 0.01 largest single layout shift score have a good CLS, against 73% of Vue sites with a largest shift of 0.01 to 0.10. Within Vue, sites with a largest shift under 0.01 have a good CLS more often.

When a single layout jump blows the entire 0.10 CLS budget

Google's Good CLS threshold is 0.10. Across 17,777 shifting sites (37.8%) whose largest single shift stays below 0.01, 86% pass field CLS, and across 16,588 sites (35.3%) at 0.01 to 0.10, 78% pass. Once a single jump lands between 0.10 and 0.25 (14.3%), good field CLS drops to 66%, and when a single shift exceeds 0.25 (12.5%, 5,884 sites), only 52% pass field CLS.