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 · All devices 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
1.5s
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 · all devices 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
fastly1.4s4% of sites
cloudflare1.4s13% of sites
akamai1.5s3% of sites
origin1.5s77% of sites
cloudfront1.6s3% of sites
vercel1.7s1% of sites
netlify2s0% of sites
VariantShare of sitesMedian
fastly 6,437 sites
4%
1.4s
cloudflare 23,785 sites
13%
1.4s
akamai 4,955 sites
3%
1.5s
origin 142,621 sites
77%
1.5s
cloudfront 6,141 sites
3%
1.6s
vercel 980 sites
1%
1.7s
netlify 343 sites
0%
2s

Fastly sites post the best median LCP (1.4s). Netlify sites trail at 2.0s. Correlation, not causation. computed

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

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

VariantSitesPassing LCPLCP
Cloudflare 12.8% 23,785 86% 1.4s
Fastly 3.5% 6,437 86% 1.4s
Akamai 2.7% 4,955 83% 1.5s
Vercel 0.5% 980 82% 1.7s
Origin 77% 142,621 82% 1.5s
Cloudfront 3.3% 6,141 81% 1.6s
Netlify 0.2% 343 78% 2.0s
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

86% of Cloudflare sites pass LCP. Netlify trails 8 points behind. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · all devices 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 Cloudflare, 86% of sites pass the LCP. With Netlify, 78% do.

The split is bigger on INP. With Akamai, 97% of sites pass it. With Netlify, 75% 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