The State of Web Vitals

Requests via CDN

How many of the page requests are served via a CDN, and which one.

Field data PhoneDesktopAll Scope All sites Q1 2026 edition · Phone field outcomes
Metric LCP INP CLS
1

At a glance the headline numbers for Requests via CDN

How many of the page requests are served via a CDN, and which one.

7
Categories
In the distribution
66.5%
Fleet share
Top: origin
99.4%
Sites with any
Of origin

66.5% of requests come straight from origin servers, with no CDN in front.

The State of Web Vitals · Q1 2026 · 94,910 sites · phone field datacorewebvitals.io/state-of-cwv
2

The requests via CDN mix who uses what, and how stable each group is

Median CLS (sites using feature)
0
0.10
0.20
0.30
0.40
0.50
Origin0.0067% of sites
Cloudflare0.0022% of sites
Fastly0.006% of sites
Cloudfront0.005% of sites
Vercel0.001% of sites
Akamai0.000% of sites
Netlify0.000% of sites
VariantShare of requestsMedian
Origin
67%
0.00
Cloudflare
22%
0.00
Fastly
6%
0.00
Cloudfront
5%
0.00
Vercel
1%
0.00
Akamai
0%
0.00
Netlify
0%
0.00

Requests via CDN. On the fleet: 66.5% origin, 22.3% cloudflare, 5.6% fastly. 99.4% of sites use at least one origin.

Origin leads by count (66.5%) and by bytes (75.2%). computed

The State of Web Vitals · Q1 2026 · 94,910 sites · phone field datacorewebvitals.io/state-of-cwv
3

Passing CLS per bucket every category and count level at once - color is the pass rate

1
2
3
4
5
6
7
8
9
10
11
Origin 66.5%
90
90
90
91
90
91
91
89
87
85
80
Cloudflare 22.3%
88
87
88
87
86
87
87
84
82
91
89
Fastly 5.6%
85
87
85
84
87
85
89
90
89
96
85
Cloudfront 4.8%
86
81
80
85
85
85
87
88
88
84
75
Vercel 0.5%
86
89
84
100
83
87
84
84
85
69
63
Akamai 0.2%
87
88
92
94
82
85
83
86
78
81
Netlify 0.1%
81
100
45
83
92
80
46
58
← few of this category on the pagemany →
60%95%+ of sites passing CLS Faded cells: under 100 sites

Each row is a category, each column its own count bucket (few on the left, many on the right); the cell is the share of those sites passing CLS.

Vercel swings the hardest: 86% of sites pass CLS with few, 69% with many. computed

The State of Web Vitals · Q1 2026 · 94,910 sites · phone field datacorewebvitals.io/state-of-cwv
4

Few vs many - does quantity cost CLS? the pass rate with few vs many of each category

60%70%80%90%100% few → many
Vercel 0.5% 86% → 69%
Cloudfront 4.8% 86% → 75%
Origin 66.5% 90% → 80%
Akamai 0.2% 87% → 86%
Fastly 5.6% 85% → 85%
Cloudflare 22.3% 88% → 89%
% of sites passing CLS · hollow ring = pages with few, solid dot = pages with many

Per category: the pass rate among pages with FEW of it (hollow ring) against pages with MANY (solid dot), worst trend first. Thin buckets are excluded from the endpoints.

More Vercel costs the most: the CLS pass rate falls from 86% with few to 69% with many. computed

The State of Web Vitals · Q1 2026 · 94,910 sites · phone field datacorewebvitals.io/state-of-cwv
5

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

A CDN moves your files closer to the visitor. Distance is round-trip time, and every request pays it: the connection setup, the request, the response. Serving static files from an edge node cuts that time for every image, script and stylesheet on the page, and those are the resources the LCP waits for.

The share matters more than the logo. A site that serves its HTML through a CDN but loads images from a slow origin still pays origin latency for its LCP image. Check what the CDN actually fronts, not just whether one is present.

How does this affect the Core Web Vitals?

Requests via CDN correlates with the LCP. With Fastly, 83% of sites pass the LCP. With Netlify, 71% do.

Go fix it Configure Cloudflare for passing the Core Web Vitals → Time to First Byte →
Related signals Last-Modified present → Uncompressed text responses → Cacheable responses → HTML size (kB) → Chrome field data from 94,910 sites, representing millions of real page loads · How we measured