CMS performance
How the most-used CMS platforms perform on real-user Core Web Vitals data.
At a glance the headline numbers for CMS performance
How the most-used CMS platforms perform on real-user Core Web Vitals data.
Wix passes CLS most often of any CMS. 97.7% of its sites pass. Adobe Commerce passes least at 73.4%. WordPress (the most-used CMS) sits at 89.0%. The gap is 24 percentage points.
The ranking sorted by CLS at p75, fastest first
| # | CMS | CLS p75 | Passing | Sites | |
|---|---|---|---|---|---|
| 1 | Wix | 0.00 | 97.7% | 5,212 | |
| 2 | Joomla | 0.01 | 91.6% | 2,329 | |
| 3 | TYPO3 | 0.02 | 92.2% | 95 | |
| 4 | Shopify | 0.02 | 94.0% | 7,616 | |
| 5 | WordPress | 0.03 | 89.0% | 58,969 | |
| 6 | Squarespace | 0.04 | 89.7% | 2,029 | |
| 7 | Drupal | 0.04 | 87.9% | 3,046 | |
| 8 | Adobe Commerce | 0.11 | 73.4% | 988 |
Passing CLS per CMS which group passes the CLS most often
98% of Wix sites pass CLS. Adobe Commerce trails 25 points behind, leaving 27% of its sites failing. computed
All five vitals at once the whole category without toggling - cell is the pass rate, small number the p75
One row per CMS, one column per vital - the cell is the share of sites passing, the small number the p75. No toggling needed to see where the category actually differs.
Wix leads on CLS: 98% of its sites pass. Adobe Commerce trails at 73%. computed
Why this matters for the Core Web Vitals, and where to start fixing it
The CMS decides a lot about your Core Web Vitals before you write a line of your own code. It controls the HTML that ships, the scripts and styles that load by default, and how images are handled. Two sites on the same platform can score very differently depending on the theme and plugins, but the platform sets the starting point and the ceiling for how much you can tune.
Start with what the platform loads that you do not need. Strip the default scripts and styles that come with themes and plugins, defer the JavaScript that is not needed for the first paint, and make sure images go out in modern formats at the right size. On script-heavy platforms the biggest wins are usually in cutting and deferring what loads on every page.
How does your CMS affect Core Web Vitals?
Among the most-used CMS platforms, Wix reaches a good CLS on 97.7% of sites; Adobe Commerce on 73.4%.
Chrome field data from 189,915 sites, representing millions of real page loads. How we measured.