---
title: "Duplicate jQuery Statistics: 12.2% Load Two Copies - PageSpeed Matters"
url: https://www.pagespeedmatters.com/resources/data-studies/duplicate-jquery-statistics
description: "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."
lang: en
---

Duplicate jQuery Statistics: 12.2% Load Two Copies (https://www.pagespeedmatters.com/resources/data-studies/duplicate-jquery-statistics)

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 (https://www.pagespeedmatters.com/resources/data-studies/duplicate-jquery-statistics)