Long Animation Frame work and the Core Web Vitals
19.8% of audited sites (36,117) record over 250ms of work inside Long Animation Frames, pushing median field INP to 92ms (94% good INP) versus 84ms (95% good INP) under 80ms.
25.7% of sites use 130 to 250ms of LoAF work Long Animation Frame work, and 96% of those sites have a good INP, against 95% of all sites.
INP pass rate
Sites with 130 to 250ms of LoAF work Long Animation Frame work have a good INP most often: 96%, against 95% of all sites. Sites with over 250ms of LoAF work LoAF duration have it least often, at 94%.
Long Animation Frame work usage
80 to 130ms of LoAF work is the most used: 30.2% of sites. 130 to 250ms of LoAF work is 25.7% of sites.
Understanding Long Animation Frame work
Why Long Animation Frames pinpoint real INP bottlenecks
Unlike classic Long Tasks, the Long Animation Frames API captures the full rendering update alongside script execution, exposing forced synchronous reflows and expensive style recalculations. Across 44,281 sites (24.3%) with under 80ms of LoAF work, 95% pass field INP at an 84ms median, compared with 94% (92ms median) on the 19.8% (36,117) exceeding 250ms.
Eliminate synchronous layout reads after DOM writes (forced reflows) and break long script evaluation tasks into smaller chunks. Across all audited sites, 24.3% stay under 80ms of LoAF work (95% good INP, 84ms median) versus 19.8% above 250ms (94% good INP, 92ms median).
How Long Animation Frame work plays out per platform
What the field data shows when you isolate a single CMS or framework.
Shopify 8,277 sites Shopify stores over 250ms of LoAF work pass field INP 7 points less often than stores under 80ms.
Across Shopify storefronts, 28% record under 80ms of LoAF work (98% INP pass rate, 87ms median), 29% sit between 80 and 130ms (97%), and 19% exceed 250ms (91% pass rate, 112ms median).
React 7,560 sites 63% of React sites record under 130ms of Long Animation Frame work.
Across React sites, 36% record under 80ms of LoAF work (95% INP pass rate, 77ms median) and 27% record 80 to 130ms (96%), compared with 92% (94ms median) on the 17% exceeding 250ms.
By Arjen Karel · 210,902 crawled sites (196,263 with all devices Chrome field data, 182,326 sites with Long Animation Frame work, October 2026). How we measured.