Duplicate jQuery Statistics: 12.2% Load Two Copies

    42,874 top 1M homepages load jQuery twice: 12.2% of the 350,642 homepages that load jQuery and 5.5% of all 782,850 top 1M homepages.

    Core Web Vitals pass rate, homepages with one vs two jQuery copies
    Two copies (34,810)40.1%
    One copy (239,941)47.5%

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

    Correlation only; jQuery Migrate is not counted as a copy.

    Source: Duplicate jQuery Statistics: 12.2% Load Two Copies - PageSpeed Matters