Display ad networks and header bidding and the Core Web Vitals
Google AdSense (89.3%), Google Publisher Tag (19.7%), Prebid.js (5.8%), Taboola (3.3%), Criteo (3.0%), and Amazon Publisher Services (2.0%) across 16,163 ad-supported sites.
89.3% of sites use Google AdSense ad networks, and 62% of those sites pass all three Core Web Vitals, against 71% of all sites.
5.8% of sites use Prebid.js ad networks, and 86% of those sites have a good LCP, against 82% of all sites.
89.3% of sites use Google AdSense ad networks, and 90% of those sites have a good INP, against 95% of all sites.
89.3% of sites use Google AdSense ad networks, and 83% of those sites have a good CLS, against 88% of all sites.
Core Web Vitals pass rate
Sites with Google AdSense ad networks pass all three Core Web Vitals most often: 62%, against 71% of all sites.
Sites with Prebid.js ad networks have a good LCP most often: 86%, against 82% of all sites. Sites with Criteo ad networks have it least often, at 73%.
Sites with Google AdSense ad networks have a good INP most often: 90%, against 95% of all sites. Sites with Criteo ad networks have it least often, at 76%.
Sites with Google AdSense ad networks have a good CLS most often: 83%, against 88% of all sites. Sites with Amazon Publisher Services ad networks have it least often, at 67%.
Ad networks usage
Google AdSense is the most used: 89.3% of sites.
How ad networks affect the four LCP phases
Across the four LCP sub-parts in Chrome's field data, the largest gap between Prebid.js and Criteo sits in time to first byte (TTFB): 496 ms median for Prebid.js against 654 ms for Criteo. Overall median field LCP is 1.6s for Prebid.js (TTFB 496 ms, load delay 414 ms, load duration 146 ms, render delay 270 ms) versus 1.8s for Criteo.
Across the four LCP sub-parts in Chrome's field data, the largest gap between Prebid.js and Criteo sits in time to first byte (TTFB): 496 ms median for Prebid.js against 654 ms for Criteo. Overall median field LCP is 1.6s for Prebid.js (TTFB 496 ms, load delay 414 ms, load duration 146 ms, render delay 270 ms) versus 1.8s for Criteo.
Across the four LCP sub-parts in Chrome's field data, the largest gap between Prebid.js and Criteo sits in time to first byte (TTFB): 496 ms median for Prebid.js against 654 ms for Criteo. Overall median field LCP is 1.6s for Prebid.js (TTFB 496 ms, load delay 414 ms, load duration 146 ms, render delay 270 ms) versus 1.8s for Criteo.
Across the four LCP sub-parts in Chrome's field data, the largest gap between Prebid.js and Criteo sits in time to first byte (TTFB): 496 ms median for Prebid.js against 654 ms for Criteo. Overall median field LCP is 1.6s for Prebid.js (TTFB 496 ms, load delay 414 ms, load duration 146 ms, render delay 270 ms) versus 1.8s for Criteo.
How ad networks plays out per platform
What the field data shows when you isolate a single CMS or framework.
WordPress 5,296 sites Ad-supported WordPress sites pass all three CWV at 52% with AdSense (94.1%) and 49% with Taboola.
Across 5,296 ad-supported WordPress sites, 94.1% run Google AdSense (52% passing all three CWV), 16.0% run Google Publisher Tag (51%), and 5.3% run Prebid.js (54%), compared with 63% across all ad-using WordPress sites.
Shopify 684 stores Among the 684 Shopify stores loading ad network tags, 86% use AdSense and 11.4% use Taboola.
Across ad-using Shopify storefronts, 85.8% load AdSense/Google Ads (73% passing all three CWV), 11.4% load Taboola, and 3.7% load Criteo (88% overall among ad-using Shopify stores).
React & Next.js 921 sites Ad-supported React sites pass all three CWV at 64% with AdSense and 39% with GPT.
Across 921 React sites running display ads, 93.7% load Google AdSense (64% passing all three CWV) and 8.8% load Google Publisher Tag (39%).
Wix 509 sites Wix sites running Google AdSense (99.8% of ad-using Wix sites) pass all three CWV at 86%.
Across the 509 Wix sites that embed display ads, 99.8% use Google AdSense and pass all three Core Web Vitals at 86% (compared with 90% across ad-using Wix sites).
By Arjen Karel · 210,902 crawled sites (196,263 with all devices Chrome field data, 16,163 sites with ad networks, October 2026). How we measured.