Third-party provider categories and the Core Web Vitals
Frameworks (88.3%), CDNs (67.3%), analytics (60.8%), tag managers (51.1%), font services (47.8%), video embeds (35.9%), and ad networks (8.3%) across 195,557 sites.
3.8% of sites use reviews third-party technology categories, and 71% of those sites pass all three Core Web Vitals, against 70% of all sites.
3.8% of sites use reviews third-party technology categories, and 85% of those sites have a good LCP, against 82% of all sites.
0.9% of sites use scheduling third-party technology categories, and 96% of those sites have a good INP, against 92% of all sites.
45.3% of sites use CMS third-party technology categories, and 90% of those sites have a good CLS, against 89% of all sites.
Core Web Vitals pass rate
Sites with reviews third-party technology categories pass all three Core Web Vitals most often: 71%, against 70% of all sites. The biggest gap is LCP, 85% against 82%.
Sites with reviews third-party technology categories have a good LCP most often: 85%, against 82% of all sites. Sites with CMS third-party categories have it least often, at 73%.
Sites with scheduling third-party technology categories have a good INP most often: 96%, against 92% of all sites. Sites with cdp third-party categories have it least often, at 82%.
Sites with CMS third-party technology categories have a good CLS most often: 90%, against 89% of all sites. Sites with cdp third-party categories have it least often, at 79%.
Third-party technology categories usage
Framework is the most used: 88.3% of sites. Reviews is 3.8% of sites.
How third-party categories affect the four LCP phases
Across the four LCP sub-parts in Chrome's field data, the largest gap between reviews and CMS sits in time to first byte (TTFB): 555 ms median for reviews against 998 ms for CMS. Overall median field LCP is 1.6s for reviews (TTFB 555 ms, load delay 499 ms, load duration 164 ms, render delay 296 ms) versus 1.9s for CMS.
Across the four LCP sub-parts in Chrome's field data, the largest gap between reviews and CMS sits in time to first byte (TTFB): 555 ms median for reviews against 998 ms for CMS. Overall median field LCP is 1.6s for reviews (TTFB 555 ms, load delay 499 ms, load duration 164 ms, render delay 296 ms) versus 1.9s for CMS.
Across the four LCP sub-parts in Chrome's field data, the largest gap between reviews and CMS sits in time to first byte (TTFB): 555 ms median for reviews against 998 ms for CMS. Overall median field LCP is 1.6s for reviews (TTFB 555 ms, load delay 499 ms, load duration 164 ms, render delay 296 ms) versus 1.9s for CMS.
Across the four LCP sub-parts in Chrome's field data, the largest gap between reviews and CMS sits in time to first byte (TTFB): 555 ms median for reviews against 998 ms for CMS. Overall median field LCP is 1.6s for reviews (TTFB 555 ms, load delay 499 ms, load duration 164 ms, render delay 296 ms) versus 1.9s for CMS.
How third-party technology categories plays out per platform
What the field data shows when you isolate a single CMS or framework.
WordPress 65,508 sites WordPress sites load external analytics on 60.9% and third-party font services on 58.8% (59% CWV pass).
Across 65,508 WordPress sites, 96.5% load a JS library, 60.9% load analytics (60% passing all three CWV), 58.8% load external font services (59%), and 57.7% use a CDN (60%).
Shopify 8,573 stores 100% of Shopify stores use a CDN, 71.5% load analytics, and 61.7% load tag managers.
Across 8,573 Shopify storefronts, 100.0% use a CDN (85% passing all three CWV), 71.5% load external analytics (82% CWV pass), and 61.7% load tag managers (81% CWV pass).
React & Next.js 9,568 sites React sites with RUM (63.8%) pass all three CWV at 84% vs 62% on sites with tag managers (39.5%).
Across 9,568 React sites, 89.7% use a CDN (75% passing all three CWV), 63.8% include Real User Monitoring (84% CWV pass), and 39.5% load tag managers (62% CWV pass).
Wix 5,825 sites Wix sites include CDN and RUM on 100% (89% CWV pass) and external analytics on 30.8%.
Across Wix sites (100%), 100% include RUM telemetry (89% passing all three CWV), 30.8% load external analytics (86% CWV pass), and 27.3% load tag managers (85% CWV pass).
By Arjen Karel · 210,902 crawled sites (126,761 with phone Chrome field data, 195,557 sites with third-party technology categories, October 2026). How we measured.