Two-Thirds of Failing Sites Fail on Just One Metric, Usually LCP

    We analyzed how sites fail Core Web Vitals. Two-thirds of failing sites fail on just one of the three metrics, so most are a single fix from passing. On mobile that fix is usually loading.

    Sites that fail on a single metric alone (mobile)
    Fail on LCP only
    18.8%
    Fail on INP only
    6.8%
    Fail on CLS only
    4.5%

    Source: PageSpeed Matters analysis of 8.17M mobile origins with full CWV data, May 2026.

    On mobile, loading is the lone culprit more often than responsiveness and stability combined.

    Sites that fail on a single metric alone (desktop)
    Fail on LCP only
    14.4%
    Fail on CLS only
    12.4%
    Fail on INP only
    0.6%

    Source: PageSpeed Matters analysis of 5.59M desktop origins with full CWV data, May 2026.

    On desktop the single fix is loading or stability. INP is almost never the lone problem.

    Source: Two-Thirds of Failing Sites Fail on Just One Metric, Usually LCP - PageSpeed Matters