Synthetic interaction sub-parts on React sites
39.9% of audited sites (2,548) complete synthetic interactions in under 35ms (99% good field INP, 47ms median), while the 14.2% exceeding 110ms reach 57ms median field INP (99% good INP).
39.9% of React sites use under 35ms lab interaction duration synthetic interaction sub-parts, and 99% of those sites have a good INP, against 99% of all React sites.
INP pass rate
Sites with under 35ms lab interaction duration synthetic interaction sub-parts have a good INP most often: 99%, against 99% of all React sites. Sites with 65 to 110ms lab interaction duration lab interaction time have it least often, at 98%.
Synthetic interaction sub-parts usage
Under 35ms lab interaction duration is the most used: 39.9% of React sites.
Synthetic interaction sub-parts per platform
Wix sets the synthetic interaction sub-parts to under 35ms lab interaction duration on 50% of its sites, and 100% of Wix sites have a good INP, against 99% of all sites.
Wix 3,480 sitesUnder 35ms lab interaction 50%35 to 65ms lab interaction 27%65 to 110ms lab interaction 16%100%
WordPress 1,894 sitesOver 110ms lab interaction 29%65 to 110ms lab interaction 25%Under 35ms lab interaction 24%35 to 65ms lab interaction 22%100%Synthetic interaction sub-parts or the platform
Does the platform explain the synthetic interaction sub-parts difference?
On Wix, 100% of sites with under 35ms lab interaction duration synthetic interaction sub-parts have a good INP, against 100% of Wix sites with 35 to 65ms lab interaction duration. Within Wix, sites with under 35ms lab interaction duration and 35 to 65ms lab interaction duration have a good INP about equally often. On WordPress, 100% of sites with under 35ms lab interaction duration synthetic interaction sub-parts have a good INP, against 98% of WordPress sites with 35 to 65ms lab interaction duration. Within WordPress, sites with under 35ms lab interaction duration and 35 to 65ms lab interaction duration have a good INP about equally often.
How input delay, processing, and presentation add up
Every user tap or click waits for background main-thread tasks to finish (input delay), runs event callbacks (processing), and recalculates styles and paints the next frame (presentation). Across 2,548 sites (39.9%) under 35ms in lab interactions, 99% pass field INP at an 47ms median, versus 99% (57ms median) on the 14.2% (904) exceeding 110ms.
Understanding synthetic interaction sub-parts
Keep event handler processing lean and yield before forcing layout or paint updates so total interaction latency stays well below the 200ms INP threshold. Across all audited sites, 39.9% finish under 35ms (99% good INP, 47ms median) versus 14.2% above 110ms (99% good INP, 57ms median).
By Arjen Karel · 9,570 crawled React sites (1,979 with desktop Chrome field data, 6,378 sites with synthetic interaction sub-parts, October 2026). How we measured.