Document lifecycle milestones and the Core Web Vitals
26.4% of audited sites (54,420) reach DOMComplete in under 350ms and pass field LCP at 90% (1.2s median), whereas the 22.2% taking over 1,500ms pass at 63% (2.1s median).
26.4% of sites use under 350ms DOMComplete document lifecycle milestones, and 90% of those sites have a good LCP, against 82% of all sites.
LCP pass rate
Sites with under 350ms DOMComplete document lifecycle milestones have a good LCP most often: 90%, against 82% of all sites. Sites with over 1,500ms DOMComplete DOMComplete time have it least often, at 63%.
Document lifecycle milestones usage
Under 350ms DOMComplete is the most used: 26.4% of sites.
The four LCP phases
Across the four LCP sub-parts in Chrome's field data, the largest gap between under 350ms DOMComplete and over 1,500ms DOMComplete sits in time to first byte (TTFB): 464 ms median for under 350ms DOMComplete against 1054 ms for over 1,500ms DOMComplete. Overall median field LCP is 1.2s for under 350ms DOMComplete (TTFB 464 ms, load delay 273 ms, load duration 129 ms, render delay 209 ms) versus 2.1s for over 1,500ms DOMComplete.
Understanding document lifecycle milestones
What DOMInteractive and DOMComplete reveal about subresource contention
DOMInteractive marks when HTML parsing finishes and deferred scripts begin executing; DOMComplete waits for all synchronous subresources. Across 54,420 sites (26.4%) reaching DOMComplete in under 350ms, 90% pass field LCP at a 1.2s median, compared with 63% (2.1s median) on the 22.2% (45,850) exceeding 1,500ms.
Defer non-critical scripts and lazy-load below-the-fold subresources so DOMInteractive and DOMComplete are not held back by slow third-party requests. Across all audited sites, 26.4% finish DOMComplete under 350ms (90% good LCP, 1.2s median) versus 22.2% above 1,500ms (63% good LCP, 2.1s median).
How document lifecycle milestones plays out per platform
What the field data shows when you isolate a single CMS or framework.
WordPress 65,505 sites WordPress sites taking over 1,500ms to reach DOMComplete pass LCP 40 points less often than sites under 350ms.
Across WordPress sites, 34% take over 1,500ms to reach DOMComplete in the lab (48% field LCP pass rate, 2.6s median) compared with 88% (1.4s median) on the 13% finishing under 350ms.
Shopify 8,573 sites 73% of Shopify stores reach DOMComplete after 700ms.
Across Shopify storefronts, 42% reach DOMComplete in 700 to 1,500ms (96% field LCP pass rate), 31% exceed 1,500ms (92%), and 24% finish in 350 to 700ms (98% pass rate, 1.2s median).
React 9,570 sites React sites reaching DOMComplete under 350ms pass field LCP 35 points more often than sites over 1,500ms.
Across React sites, 48% reach DOMComplete in under 350ms (93% field LCP pass rate, 1.1s median) and 18% take over 1,500ms (58% pass rate, 2.2s median).
By Arjen Karel · 210,902 crawled sites (126,761 with phone Chrome field data, 206,118 sites with document lifecycle milestones, October 2026). How we measured.