Content management systems (CMS) and the Core Web Vitals
WordPress (28.4%), Shopify (0.6%), Wix (70.6%), Drupal (0.2%), Joomla (0.1%), Squarespace (<0.1%), and Adobe Commerce (<0.1%): how the major CMS platforms compare on LCP, INP, and CLS.
70.6% of React sites use Wix as their CMS, and 90% of those sites pass all three Core Web Vitals, against 76% of all React sites.
70.6% of React sites use Wix as their CMS, and 94% of those sites have a good LCP, against 85% of all React sites.
28.4% of React sites use WordPress as their CMS, and 98% of those sites have a good INP, against 95% of all React sites.
70.6% of React sites use Wix as their CMS, and 98% of those sites have a good CLS, against 92% of all React sites.
Core Web Vitals pass rate
Sites with Wix as their CMS pass all three Core Web Vitals most often: 90%, against 76% of all React sites. The biggest gap is LCP, 94% against 85%.
Sites with Wix as their CMS have a good LCP most often: 94%, against 85% of all React sites. Sites with WordPress as their CMS have it least often, at 61%.
Sites with WordPress as their CMS have a good INP most often: 98%, against 95% of all React sites. Sites with Wix as their CMS have it least often, at 97%.
Sites with Wix as their CMS have a good CLS most often: 98%, against 92% of all React sites. Sites with WordPress as their CMS have it least often, at 85%.
As their CMS usage
Wix is the most used: 70.6% of React sites.
Where CMS platforms differ: the four LCP phases
Across the four LCP sub-parts in Chrome's field data, the largest gap between Wix and WordPress sits in time to first byte (TTFB): 415 ms median for Wix against 1300 ms for WordPress. Overall median field LCP is 1.2s for Wix (TTFB 415 ms, load delay 457 ms, load duration 137 ms, render delay 151 ms) versus 2.2s for WordPress.
Across the four LCP sub-parts in Chrome's field data, the largest gap between Wix and WordPress sits in time to first byte (TTFB): 415 ms median for Wix against 1300 ms for WordPress. Overall median field LCP is 1.2s for Wix (TTFB 415 ms, load delay 457 ms, load duration 137 ms, render delay 151 ms) versus 2.2s for WordPress.
Across the four LCP sub-parts in Chrome's field data, the largest gap between Wix and WordPress sits in time to first byte (TTFB): 415 ms median for Wix against 1300 ms for WordPress. Overall median field LCP is 1.2s for Wix (TTFB 415 ms, load delay 457 ms, load duration 137 ms, render delay 151 ms) versus 2.2s for WordPress.
Across the four LCP sub-parts in Chrome's field data, the largest gap between Wix and WordPress sits in time to first byte (TTFB): 415 ms median for Wix against 1300 ms for WordPress. Overall median field LCP is 1.2s for Wix (TTFB 415 ms, load delay 457 ms, load duration 137 ms, render delay 151 ms) versus 2.2s for WordPress.
As their CMS per platform
Wix sets the as their CMS to Wix on 100% of its sites, and 90% of Wix sites pass all three Core Web Vitals, against 76% of all sites. WordPress sets the as their CMS to WordPress on 100% of its sites, and 54% of WordPress sites pass all three.
Wix sets the as their CMS to Wix on 100% of its sites, and 94% of Wix sites have a good LCP, against 85% of all sites. WordPress sets the as their CMS to WordPress on 100% of its sites, and 61% of WordPress sites have a good LCP.
Wix sets the as their CMS to Wix on 100% of its sites, and 97% of Wix sites have a good INP, against 95% of all sites. WordPress sets the as their CMS to WordPress on 100% of its sites, and 98% of WordPress sites have a good INP.
Wix sets the as their CMS to Wix on 100% of its sites, and 98% of Wix sites have a good CLS, against 92% of all sites. WordPress sets the as their CMS to WordPress on 100% of its sites, and 85% of WordPress sites have a good CLS.
Wix 5,824 sitesWix 100%90%94%97%98%
WordPress 2,342 sitesWordPress 100%54%61%98%85%Managed SaaS defaults versus self-hosted CMS flexibility
Does the platform explain the as their CMS difference?
Almost every site with Wix as their CMS is a Wix site, and almost every Wix site has Wix as their CMS, so the data can't tell Wix as their CMS and Wix apart.
Almost every site with Wix as their CMS is a Wix site, and almost every Wix site has Wix as their CMS, so the data can't tell Wix as their CMS and Wix apart.
Almost every site with WordPress as their CMS is a WordPress site, and almost every WordPress site has WordPress as their CMS, so the data can't tell WordPress as their CMS and WordPress apart.
Almost every site with Wix as their CMS is a Wix site, and almost every Wix site has Wix as their CMS, so the data can't tell Wix as their CMS and Wix apart.
Why managed SaaS platforms lead on out-of-the-box pass rates
Managed SaaS platforms control the entire delivery stack from edge CDN and HTTP/3 termination to automatic AVIF/WebP image transcoding and font-display rules. Wix (90% passing all three Core Web Vitals, 1.2s median LCP) and Shopify (88% passing all three, 1.3s median LCP) bake those defaults into the platform. Self-hosted platforms like WordPress (54% passing all three, 2.2s median LCP), Drupal (76%), and Adobe Commerce (0%) leave hosting, caching, and theme architecture to each site owner.
Understanding CMS performance
Focus on your platform's specific bottlenecks rather than migrating CMSes for performance alone. 54% of WordPress sites pass all three Core Web Vitals, proving that a well-configured self-hosted site with full-page edge caching, an HTML <code><img></code> hero, and restrained plugin scripts matches any SaaS platform. On WordPress, the biggest gains come from edge HTML caching (TTFB), replacing CSS background-image heroes with <code><img></code> tags, and removing blocking font and slider plugins. On Shopify (88% passing all three), the edge and image CDN are already fast, so optimization focuses on removing lazy-loading from the main banner and auditing third-party app scripts that hurt INP.
By Arjen Karel · 9,570 crawled React sites (9,110 with all devices Chrome field data, 8,250 sites with as their CMS, October 2026). How we measured.