Shopify iframe count and the Core Web Vitals

Sites with 1 iframe iframe count per page have a good CLS most often: 96%, against 94% of all Shopify sites. Sites with 4+ iframes iframe count have it least often, at 89%.

Sites with 1 iframe iframe count per page have a good INP most often: 98%, against 96% of all Shopify sites. Sites with 4+ iframes iframe count have it least often, at 90%.

Sites with 1 iframe iframe count per page have a good LCP most often: 97%, against 96% of all Shopify sites. Sites with 4+ iframes iframe count have it least often, at 92%.

Four in five Shopify sites uses iframe count per page, and two in five of those use 1 iframe.

On jQuery, 32% of sites use 2 to 3 iframes iframe count per page, and 91% of jQuery sites have a good CLS, against 94% of all sites. On Vue, 29% of sites use 2 to 3 iframes, and 91% of Vue sites have a good CLS.

On jQuery, 32% of sites use 2 to 3 iframes iframe count per page, and 95% of jQuery sites have a good INP, against 96% of all sites. On Vue, 29% of sites use 2 to 3 iframes, and 94% of Vue sites have a good INP.

On jQuery, 32% of sites use 2 to 3 iframes iframe count per page, and 94% of jQuery sites have a good LCP, against 96% of all sites. On Vue, 29% of sites use 2 to 3 iframes, and 95% of Vue sites have a good LCP.

FrameworkIframe count per page on its sitesGood CLS

All Shopify sites 8,246 sites1 iframe 32%2 to 3 iframes 28%0 iframes 21%4+ iframes 18%94%

jQuery 3,153 sites2 to 3 iframes 32%1 iframe 28%4+ iframes 24%0 iframes 16%91%

Vue 933 sites2 to 3 iframes 29%1 iframe 27%4+ iframes 24%0 iframes 19%91%

1 iframe 2 to 3 iframes 0 iframes 4+ iframes

Does the framework explain the iframe count per page difference?

On jQuery, 94% of sites with 1 iframe iframe count per page have a good CLS, against 92% of jQuery sites with 0 iframes. Within jQuery, sites with 1 iframe and 0 iframes have a good CLS about equally often. On Vue, 93% of sites with 1 iframe iframe count per page have a good CLS, against 93% of Vue sites with 0 iframes. Within Vue, sites with 1 iframe and 0 iframes have a good CLS about equally often.

On jQuery, 97% of sites with 1 iframe iframe count per page have a good INP, against 97% of jQuery sites with 0 iframes. Within jQuery, sites with 1 iframe and 0 iframes have a good INP about equally often. On Vue, 94% of sites with 1 iframe iframe count per page have a good INP, against 97% of Vue sites with 0 iframes. Within Vue, sites with 1 iframe and 0 iframes have a good INP about equally often.

On jQuery, 96% of sites with 1 iframe iframe count per page have a good LCP, against 97% of jQuery sites with 0 iframes. Within jQuery, sites with 1 iframe and 0 iframes have a good LCP about equally often. On Vue, 96% of sites with 1 iframe iframe count per page have a good LCP, against 97% of Vue sites with 0 iframes. Within Vue, sites with 1 iframe and 0 iframes have a good LCP about equally often.

How embedded iframes destabilize layout and multiply main-thread contexts

Every <iframe> creates an independent browsing context with its own document, styles, and scripts, and frequently resizes asynchronously after load. Across 1,761 sites (21.4%) with 0 iframes, 96% pass field CLS. Adding 1 iframe (32.4%) lowers good CLS to 96%, 2 to 3 iframes (28.2%) drops good CLS to 93%, and 4 or more iframes (18.0%, 1,488 sites) pulls good CLS down to 89%.