The State of Web Vitals

Main CDN

Which CDN, if any, serves the HTML document itself.

Field data PhoneDesktopAll Scope All sites Q2 2026 edition · Desktop field outcomes
Metric LCP INP CLS
1

At a glance the headline numbers for Main CDN

Which CDN, if any, serves the HTML document itself.

7
Categories
185,262 sites
77.0%
Top share
origin
1.4s
Top LCP
Median for origin

77.0% of HTML documents are served without a CDN.

The State of Web Vitals · Q2 2026 · 189,915 sites · desktop field datacorewebvitals.io/state-of-cwv
2

Main CDN who uses what, and how fast each group loads

Median LCP
0
0.5s
1s
1.5s
2s
2.5s
3s
3.5s
4s
akamai1.3s3% of sites
fastly1.4s4% of sites
origin1.4s77% of sites
cloudflare1.4s13% of sites
vercel1.4s1% of sites
cloudfront1.5s3% of sites
netlify1.7s0% of sites
VariantShare of sitesMedian
akamai 4,955 sites
3%
1.3s
fastly 6,437 sites
4%
1.4s
origin 142,621 sites
77%
1.4s
cloudflare 23,785 sites
13%
1.4s
vercel 980 sites
1%
1.4s
cloudfront 6,141 sites
3%
1.5s
netlify 343 sites
0%
1.7s

Akamai sites post the best median LCP (1.3s). Netlify sites trail at 1.7s. Correlation, not causation. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · desktop field datacorewebvitals.io/state-of-cwv
3

Passing LCP per main CDN which group passes the LCP most often

VariantSitesPassing LCPLCP
Vercel 0.5% 980 90% 1.4s
Akamai 2.7% 4,955 89% 1.3s
Cloudflare 12.8% 23,785 88% 1.4s
Fastly 3.5% 6,437 87% 1.4s
Origin 77% 142,621 86% 1.4s
Cloudfront 3.3% 6,141 84% 1.5s
Netlify 0.2% 343 78% 1.7s
Good Needs Improvement Poor Sorted best-passing first · median colored by its own rating · pass = good LCP (2.5s at p75) · one value per site

90% of Vercel sites pass LCP. Netlify trails 12 points behind. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · desktop field datacorewebvitals.io/state-of-cwv
4

Why this matters for the Core Web Vitals, and where to start fixing it

Everything starts after the HTML arrives. The document's TTFB sits under every other phase: the browser cannot discover, download or render anything before it has the markup. Serving the document through a CDN terminates TLS close to the visitor, and when the HTML is edge-cached it removes the origin round trip completely.

HTML is the hardest thing to put on a CDN because it is the dynamic part. Full-page edge caching is the big win when the content allows it. Even without it, edge termination and a warm route to the origin cut the TTFB.

How does this affect the Core Web Vitals?

Main CDN correlates with the LCP. With Vercel, 90% of sites pass the LCP. With Netlify, 78% do.

Go fix it Configure Cloudflare for passing the Core Web Vitals → Time to First Byte → Free website cache warmer →
Related signals ETag present → Requests via CDN → HTTP protocol mix → HTTP protocol → Chrome field data from 189,915 sites, representing millions of real page loads · How we measured