INP on Mobile vs Desktop: 97.9% of Desktop Sites Pass, Only 82.5% on Mobile

    We measured Interaction to Next Paint across 18 million websites. On desktop it is all but solved, with 97.9% passing. On mobile just 82.5% do, the widest device gap of any Core Web Vital.

    INP pass rate by device
    Desktop
    97.9%
    Mobile
    82.5%

    Source: PageSpeed Matters analysis of Chrome UX Report field data, May 2026.

    Responsiveness is nearly universal on desktop and materially worse on phones, a 15.4 point split.

    Device gap by Core Web Vital (desktop minus mobile, points)
    INP (responsiveness)
    15.4 pts
    LCP (loading)
    11.8 pts
    CLS (stability)
    5.2 pts

    Source: PageSpeed Matters analysis, mobile and desktop 75th-percentile field data, May 2026. CLS is mobile-better.

    If you want one number that captures the mobile web running on weaker hardware, INP is it.

    Source: INP on Mobile vs Desktop: 97.9% of Desktop Sites Pass, Only 82.5% on Mobile - PageSpeed Matters