admin-ajax.php Statistics: 13.1% of WordPress Homepages

    13.1% of top 1M WordPress homepages (16,171 of 123,500) call admin-ajax.php during load before the visitor does anything, adding uncached server work.

    Core Web Vitals pass rate, WordPress homepages with vs without an admin-ajax.php call on load
    Call admin-ajax.php (14,663)36.8%
    No call (93,159)50.3%

    Source: PageSpeed Matters. HTTP Archive top 1M crawl, Sept 2026, mobile, CrUX field data.

    Correlation only; the call often comes with other plugin weight.

    Source: admin-ajax.php Statistics: 13.1% of WordPress Homepages - PageSpeed Matters