Core Web Vitals Decay 2026: 19.2% of Passers Now Fail

    Of 127,675 top 1M sites that passed Core Web Vitals in Sept 2024, 19.2% (24,526) fail in Sept 2026, while 51,045 sites went from failing to passing.

    Which metric now fails on sites that lost their Core Web Vitals pass (24,526 sites)
    LCP48.4%
    INP39.9%
    CLS32.6%

    Source: PageSpeed Matters. HTTP Archive top 1M crawls, Sept 2024 and Sept 2026, same origins, CrUX p75.

    A site can fail more than one metric, so the shares overlap.

    Source: Core Web Vitals Decay 2026: 19.2% of Passers Now Fail - PageSpeed Matters