Cookie count on React sites
7.9% of audited sites (756) set zero cookies on initial load and pass LCP at 77% (1.7s median), whereas the 19.5% setting 6 or more cookies pass at 64% (2.1s median).
43.3% of React sites use 3 to 5 cookies cookie count, and 92% of those sites have a good LCP, against 85% of all React sites.
LCP pass rate
Sites with 3 to 5 cookies cookie count have a good LCP most often: 92%, against 85% of all React sites. Sites with 6 or more cookies cookies have it least often, at 64%.
Cookie count usage
3 to 5 cookies is the most used: 43.3% of React sites.
The four LCP phases
Across the four LCP sub-parts in Chrome's field data, the largest gap between 3 to 5 cookies and 6 or more cookies sits in time to first byte (TTFB): 419 ms median for 3 to 5 cookies against 1060 ms for 6 or more cookies. Overall median field LCP is 1.2s for 3 to 5 cookies (TTFB 419 ms, load delay 431 ms, load duration 140 ms, render delay 160 ms) versus 2.1s for 6 or more cookies.
Cookie count per platform
Wix sets the cookie count to 3 to 5 cookies on 58% of its sites, and 94% of Wix sites have a good LCP, against 85% of all sites. WordPress sets the cookie count to 6 or more cookies on 53% of its sites, and 61% of WordPress sites have a good LCP.
Wix 5,824 sites3 to 5 cookies 58%1 to 2 cookies 38%94%
WordPress 2,342 sites6+ cookies 53%0 cookies 19%1 to 2 cookies 15%3 to 5 cookies 13%61%Cookie count or the platform
Does the platform explain the cookie count difference?
On Wix, 95% of sites with 3 to 5 cookies cookie count have a good LCP, against 94% of Wix sites with 1 to 2 cookies. Within Wix, sites with 3 to 5 cookies and 1 to 2 cookies have a good LCP about equally often. On WordPress, 65% of sites with 3 to 5 cookies cookie count have a good LCP, against 69% of WordPress sites with 1 to 2 cookies. Within WordPress, sites with 3 to 5 cookies and 1 to 2 cookies have a good LCP about equally often.
How cookie proliferation signals CDN bypass and tracker bloat
High cookie counts reflect two compounding problems: origin Set-Cookie headers that force CDNs to bypass full-page HTML caching, and heavy marketing/ad-tech tags firing during page load. Across 756 sites (7.9%) setting zero cookies, 77% pass field LCP at a 1.7s median, compared with 64% (2.1s median) on the 19.5% (1,868) setting 6+ cookies.
Understanding cookie count
Avoid setting session or personalization cookies on anonymous landing pages so CDN edge caches can serve full HTML without Set-Cookie bypasses, and gate marketing cookies behind consent interaction. Across all audited sites, 7.9% set zero cookies (77% good LCP, 1.7s median) versus 19.5% setting 6+ cookies (64% good LCP, 2.1s median).
By Arjen Karel · 9,570 crawled React sites (9,110 with all devices Chrome field data, October 2026). How we measured.