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
631ms
Best TTFB (p75)
Google Cloud CDN
The State of Web Vitals · October 2026 · React sites (9,570) · phone 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 | 631ms | 82.4% | 6,456 | |
| 2 | CloudFront | 727ms | 77.7% | 7,234 | |
| 3 | Fastly | 807ms | 74.7% | 7,837 | |
| 4 | Vercel Edge | 1.1s | 68.5% | 93 | |
| 5 | Netlify Edge | 1.2s | 6.6% | 79 | |
| 6 | Cloudflare | 1.3s | 59.2% | 3,558 | |
| 7 | Akamai | 1.5s | 47.1% | 223 | |
| 8 | jsDelivr | 1.6s | 47.2% | 281 | |
| 9 | Bunny CDN | 1.7s | 44.8% | 366 | |
| 10 | cdnjs | 1.8s | 41.5% | 386 | |
| 11 | unpkg | 1.9s | 40.4% | 239 |
The State of Web Vitals · October 2026 · React sites (9,570) · phone field datacorewebvitals.io/state-of-cwv
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Passing TTFB per CDN which group passes the TTFB most often
CDNSitesPassing TTFBp75
Google Cloud CDN 67.5% 6,456 631ms
CloudFront 75.6% 7,234 727ms
Fastly 81.9% 7,837 807ms
Vercel Edge 1% 93 1.1s
Imperva/Incapsula 0.2% 15 972ms
Cloudflare 37.2% 3,558 1.3s
Azure CDN 0.3% 32 1.0s
jsDelivr 2.9% 281 1.6s
Akamai 2.3% 223 1.5s
Bunny CDN 3.8% 366 1.7s
cdnjs 4% 386 1.8s
unpkg 2.5% 239 1.9s
KeyCDN 0.3% 24 2.0s
Netlify Edge 0.8% 79 1.2s
Good Needs Improvement Poor Sorted best-passing first · median colored by its own rating · pass = good TTFB (800ms at p75) · one value per site
82% of Google Cloud CDN sites pass TTFB. Unpkg trails 42 points behind, leaving 60% of its sites failing. computed
The State of Web Vitals · October 2026 · React sites (9,570) · phone 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%
871.9s
93120ms
930.00
851.4s
75807ms
CloudFront 75.6%
891.8s
94115ms
940.00
871.3s
78727ms
Google Cloud CDN 67.5%
921.7s
94109ms
960.00
911.2s
82631ms
Cloudflare 37.2%
772.4s
89144ms
870.02
731.9s
591.3s
cdnjs 4%
633.0s
91154ms
820.07
562.4s
421.8s
Bunny CDN 3.8%
692.8s
89144ms
850.07
642.3s
451.7s
jsDelivr 2.9%
692.7s
82171ms
750.11
612.1s
471.6s
unpkg 2.5%
563.1s
83167ms
740.11
502.5s
401.9s
Akamai 2.3%
712.6s
85163ms
830.05
622.0s
471.5s
Vercel Edge 1%
762.2s
83165ms
760.04
711.9s
691.1s
Netlify Edge 0.8%
792.4s
18777ms
130.33
861.5s
71.2s
Azure CDN 0.3%
702.6s
77169ms
800.04
702.1s
501.0s
KeyCDN 0.3%
713.2s
91171ms
640.19
573.2s
392.0s
Imperva/Incapsula 0.2%
702.4s
100130ms
700.09
801.7s
60972ms
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: 82% of its sites pass. unpkg trails at 40%. computed
The State of Web Vitals · October 2026 · React sites (9,570) · phone 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.