CDN impact React sites
Time to first byte by CDN provider, measured in real-user Chrome data.
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At a glance the headline numbers for CDN impact
Time to first byte by CDN provider, measured in real-user Chrome data.
11
Providers ranked
After min-sites filter
26,752
Sites in sample
Combined across all items
1.2s
Best TTFB (p75)
Google Cloud CDN
The State of Web Vitals · October 2026 · React sites (9,570) · desktop field datacorewebvitals.io/state-of-cwv
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The ranking sorted by TTFB at p75, fastest first
| # | Provider | TTFB p75 | Passing | Sites | |
|---|---|---|---|---|---|
| 1 | Google Cloud CDN | 1.2s | 65.0% | 6,456 | |
| 2 | Vercel Edge | 1.3s | 66.7% | 93 | |
| 3 | CloudFront | 1.4s | 57.9% | 7,234 | |
| 4 | Fastly | 1.4s | 55.9% | 7,837 | |
| 5 | Akamai | 1.4s | 51.8% | 223 | |
| 6 | jsDelivr | 1.6s | 45.0% | 281 | |
| 7 | Cloudflare | 1.7s | 47.2% | 3,558 | |
| 8 | Bunny CDN | 1.7s | 46.2% | 366 | |
| 9 | Netlify Edge | 1.8s | 50.0% | 79 | |
| 10 | cdnjs | 1.9s | 41.7% | 386 | |
| 11 | unpkg | 2.0s | 34.0% | 239 |
The State of Web Vitals · October 2026 · React sites (9,570) · desktop field datacorewebvitals.io/state-of-cwv
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Passing TTFB per CDN which group passes the TTFB most often
CDNSitesPassing TTFBp75
KeyCDN 0.3% 24 893ms
Vercel Edge 1% 93 1.3s
Google Cloud CDN 67.5% 6,456 1.2s
CloudFront 75.6% 7,234 1.4s
Fastly 81.9% 7,837 1.4s
Akamai 2.3% 223 1.4s
Netlify Edge 0.8% 79 1.8s
Azure CDN 0.3% 32 1.4s
Imperva/Incapsula 0.2% 15 1.2s
Cloudflare 37.2% 3,558 1.7s
Bunny CDN 3.8% 366 1.7s
jsDelivr 2.9% 281 1.6s
cdnjs 4% 386 1.9s
unpkg 2.5% 239 2.0s
Good Needs Improvement Poor Sorted best-passing first · median colored by its own rating · pass = good TTFB (800ms at p75) · one value per site
65% of Google Cloud CDN sites pass TTFB. Unpkg trails 31 points behind, leaving 66% of its sites failing. computed
The State of Web Vitals · October 2026 · React sites (9,570) · desktop field datacorewebvitals.io/state-of-cwv
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All five vitals at once the whole category without toggling - cell is the pass rate, small number the p75
LCP
INP
CLS
FCP
TTFB
Fastly 81.9%
802.2s
9967ms
810.07
781.6s
561.4s
CloudFront 75.6%
812.2s
9966ms
830.06
801.5s
581.4s
Google Cloud CDN 67.5%
871.9s
10061ms
890.03
861.1s
651.2s
Cloudflare 37.2%
752.5s
9974ms
730.12
712.0s
471.7s
cdnjs 4%
663.0s
9978ms
660.16
582.3s
421.9s
Bunny CDN 3.8%
732.6s
9881ms
640.18
672.1s
461.7s
jsDelivr 2.9%
752.4s
9878ms
620.19
652.0s
451.6s
unpkg 2.5%
663.0s
10068ms
630.16
552.5s
342.0s
Akamai 2.3%
772.3s
9984ms
680.17
731.8s
521.4s
Vercel Edge 1%
772.1s
9690ms
710.15
741.8s
671.3s
Netlify Edge 0.8%
672.7s
10086ms
670.14
672.3s
501.8s
Azure CDN 0.3%
862.2s
10070ms
800.09
671.8s
501.4s
KeyCDN 0.3%
782.1s
10068ms
330.24
891.7s
71893ms
Imperva/Incapsula 0.2%
752.1s
10064ms
750.11
1001.3s
501.2s
60%95%+ passing Cell: pass rate, small number = p75 · faded rows: under 100 sites
One row per CDN, one column per vital - the cell is the share of sites passing, the small number the p75. No toggling needed to see where the category actually differs.
Google Cloud CDN leads on TTFB: 65% of its sites pass. unpkg trails at 34%. computed
The State of Web Vitals · October 2026 · React sites (9,570) · desktop field datacorewebvitals.io/state-of-cwv
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Related signals Marketing pixels (10) → Bot detection (8) → Forms (4) → Personalization (6) → 210,902 crawled sites with Chrome field data, representing millions of real page loads · How we measured
210,902 crawled sites with Chrome field data, representing millions of real page loads. How we measured.