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title: "WordPress Passes Core Web Vitals Least Often of Any Major CMS, at 38.4% - PageSpeed Matters"
description: "WordPress runs more of the web than every other CMS combined, and passes Google's Core Web Vitals on mobile just 38.4% of the time, the lowest of any major platform. The reason is loading, not responsiveness."
lang: en
json-ld:
---

[WordPress Passes Core Web Vitals Least Often of Any Major CMS, at 38.4%](https://www.pagespeedmatters.com/resources/data-studies/core-web-vitals-by-cms)

WordPress runs more of the web than every other CMS combined, and passes Google's Core Web Vitals on mobile just 38.4% of the time, the lowest of any major platform. The reason is loading, not responsiveness.

Core Web Vitals pass rate by CMS (mobile)

Duda

60.7% 

Drupal

54.9% 

Webflow

54.4% 

Wix

53% 

Squarespace

52.6% 

Joomla

42.1% 

WordPress

38.4% 

Source: PageSpeed Matters analysis of 3.7 million sites with CrUX field data, June 2026.

The single most popular way to build a website is the one least likely to pass Google's performance bar.

Good loading (LCP) by CMS (mobile)

Duda

95.1% 

Wix

86.1% 

Squarespace

80.1% 

Drupal

78.1% 

WordPress

59.2% 

Source: PageSpeed Matters analysis, mobile 75th-percentile field data, June 2026.

The hosted builders control the whole rendering pipeline, so fast loading is the default rather than the reward for tuning.

Source: [WordPress Passes Core Web Vitals Least Often of Any Major CMS, at 38.4% - PageSpeed Matters](https://www.pagespeedmatters.com/resources/data-studies/core-web-vitals-by-cms)