Core Web Vitals by CMS, 2025: Duda and Wix lead, WordPress lags

The platform a site runs on still predicts whether it passes Core Web Vitals more than most teams admit. HTTP Archive’s 2025 Web Almanac ran its annual CMS chapter against the July 2025 Chrome UX Report dataset and found a 40-point spread between the best and worst of ten major platforms: Duda’s mobile sites passed all three metrics 85% of the time, WordPress’s passed 45% of the time.

Which platforms pass, and which don’t#

The chapter’s Figure 12.8 tracks the combined Core Web Vitals pass rate, meaning a site has to clear LCP, CLS and INP together to count as good. Duda topped the list at 85%, TYPO3 CMS followed at 79%, and Wix posted the single biggest jump of any platform, rising from 55% in 2024 to 74% in 2025. WordPress sat near the bottom at 45%, and Weebly was the only platform in the whole comparison to lose ground, slipping to 47%.

Platform	2025 mobile pass rate	Year-over-year change
Duda	85%	+11 points
TYPO3 CMS	79%	about +5 points
Wix	74%	+14 points
Weebly	47%	about -1 point
WordPress	45%	about +4 points

The Almanac’s own framing ties the gap to how much control a platform keeps over its templates and defaults: “platforms with more tightly managed environments see the largest gains.” Wix and Duda both run closed, vertically integrated builders where the company controls image handling and script loading by default. WordPress’s ecosystem of themes and plugins gives site owners more freedom and more ways to regress performance, which the chapter treats as the likely reason its pass rate improves more slowly even as the platform itself keeps shipping optimizations.

Where the metrics split apart#

Looking at each Core Web Vital on its own shows the platforms don’t move together. On LCP, Duda led at 94% and Wix followed at 81%, while the Almanac reports the industry-wide “good” LCP rate at 54% of all sites. Wix had the largest year-over-year LCP gain at roughly 10 points.

CLS told a different story: Wix itself became the CLS leader, rising from about 86% in 2024 to 95% in 2025, ahead of Duda at 93% and Squarespace at 89%. Weebly was again the outlier, its CLS pass rate dropping to 58% while WordPress and Joomla held steady near 84%.

INP was the tightest and slowest-moving metric of the three. Squarespace led at 96%, TYPO3 CMS followed at 95% and Duda at 94%, while 1C-Bitrix and Weebly tied for last at 71%. The Almanac calls INP progress “modest” compared with LCP and CLS and attributes the slow pace to how hard it is to manage JavaScript, long tasks and third-party scripts, a problem it says no CMS has solved at scale yet.

Why we care#

A CMS choice is a Core Web Vitals starting point, not a guarantee. A site on Duda or Wix begins closer to passing by default; a site on WordPress starts further back and depends more on the theme, plugins and hosting choices layered on top. Neither extreme is fixed: WordPress still improved year over year, and Weebly proves a managed platform can also regress.

INP is the metric no platform has cracked. Even the leaders plateau in the mid-90s and the laggards sit 25 points behind, a gap the Almanac attributes to third-party scripts and JavaScript weight rather than anything platform-specific. Teams auditing Core Web Vitals by CMS should treat INP as the metric least explained by platform choice alone, and the one most worth auditing script by script regardless of what the site runs on.