93.7% of React sites use Google AdSense ad networks, and 55% of those sites pass all three Core Web Vitals, against 63% of all React sites.
93.7% of React sites use Google AdSense ad networks, and 68% of those sites have a good LCP, against 79% of all React sites.
93.7% of React sites use Google AdSense ad networks, and 97% of those sites have a good INP, against 99% of all React sites.
93.7% of React sites use Google AdSense ad networks, and 75% of those sites have a good CLS, against 80% of all React sites.
The State of Web Vitals · October 2026 · React: 9,570 crawled sites · 1,979 with desktop field data · 921 sites with ad networksBy Arjen Karel · corewebvitals.io/state-of-cwv
1
Core Web Vitals pass rate
Sites with Google AdSense ad networks pass all three Core Web Vitals most often: 55%, against 63% of all React sites.
Sites with Google AdSense ad networks have a good LCP most often: 68%, against 79% of all React sites.
Sites with Google AdSense ad networks have a good INP most often: 97%, against 99% of all React sites.
Sites with Google AdSense ad networks have a good CLS most often: 75%, against 80% of all React sites.
SitesAll three good · at least one needs improvement · at least one poor
All React sites1,97963%
Google AdSense 93.7%25055%
Google Publisher Tag (GPT) 8.8%4044%
Criteo 2.1%1741%
Prebid.js Header Bidding 2.0%1233%
Index Exchange 0.7%633%
SitesGood, needs improvement, poor LCPMedian
All React sites1,97979%1.5s
Criteo 2.1%1788%1.8s
Prebid.js Header Bidding 2.0%1283%1.5s
Index Exchange 0.7%683%2.0s
Google Publisher Tag (GPT) 8.8%4078%1.9s
Google AdSense 93.7%25068%1.9s
SitesGood, needs improvement, poor INPMedian
All React sites1,97999%48ms
Criteo 2.1%17100%130ms
Index Exchange 0.7%6100%130ms
Google AdSense 93.7%25097%57ms
Prebid.js Header Bidding 2.0%1292%84ms
Google Publisher Tag (GPT) 8.8%4090%83ms
SitesGood, needs improvement, poor CLSMedian
All React sites1,97980%0.02
Google AdSense 93.7%25075%0.03
Google Publisher Tag (GPT) 8.8%4057%0.08
Prebid.js Header Bidding 2.0%1250%0.10
Index Exchange 0.7%650%0.10
Criteo 2.1%1747%0.11
GoodNeeds improvementPoorSites: with Chrome field data
The State of Web Vitals · October 2026 · React: 9,570 crawled sites · 1,979 with desktop field data · 921 sites with ad networksBy Arjen Karel · corewebvitals.io/state-of-cwv
Google AdSense is the most used: 93.7% of React sites.
Sites using each option (sites can use more than one) 921 sites
Google AdSense 93.7%
Google AdSense 93.7% Google Publisher Tag (GPT) 8.8% Criteo 2.1% Prebid.js Header Bidding 2.0% Index Exchange 0.7%
The State of Web Vitals · October 2026 · React: 9,570 crawled sites · 1,979 with desktop field data · 921 sites with ad networksBy Arjen Karel · corewebvitals.io/state-of-cwv
3
How ad networks affect the four LCP phases
Median LCP phase breakdown (Chrome field p75) Load delay Median LCP
React sites with ad networks 220768 ms452 ms452 mslab 434 ms1.8s
Google AdSense 194851 ms459 ms259 ms459 mslab 452 ms1.9s
Google Publisher Tag (GPT) 34527 ms750 ms750 mslab 885 ms1.9s
TTFB Resource load delay Resource load time Element render delay
The State of Web Vitals · October 2026 · React: 9,570 crawled sites · 1,979 with desktop field data · 921 sites with ad networksBy Arjen Karel · corewebvitals.io/state-of-cwv
4
Ad networks per platform
Wix sets the ad networks to Google AdSense on 100% of its sites, and 88% of Wix sites pass all three Core Web Vitals, against 63% of all sites.
Wix sets the ad networks to Google AdSense on 100% of its sites, and 92% of Wix sites have a good LCP, against 79% of all sites.
Wix sets the ad networks to Google AdSense on 100% of its sites, and 100% of Wix sites have a good INP, against 99% of all sites.
Wix sets the ad networks to Google AdSense on 100% of its sites, and 96% of Wix sites have a good CLS, against 80% of all sites.
PlatformAd networks on its sitesPass all threeGood LCPGood INPGood CLS
React sites with ad networks 921 sitesGoogle AdSense 94%63%79%99%80%
Wix 509 sitesGoogle AdSense 100%88%92%100%96% Google AdSense Google Publisher Tag (GPT) Criteo Prebid.js Header Bidding Index Exchange
The State of Web Vitals · October 2026 · React: 9,570 crawled sites · 1,979 with desktop field data · 921 sites with ad networksBy Arjen Karel · corewebvitals.io/state-of-cwv