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
692ms
Best TTFB (p75)
Google Cloud CDN
The State of Web Vitals · October 2026 · React sites (9,570) · all devices 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 | 692ms | 79.4% | 6,456 | |
| 2 | CloudFront | 798ms | 75.1% | 7,234 | |
| 3 | Fastly | 877ms | 72.3% | 7,837 | |
| 4 | Vercel Edge | 975ms | 65.6% | 93 | |
| 5 | Netlify Edge | 1.2s | 8.2% | 79 | |
| 6 | Cloudflare | 1.3s | 57.9% | 3,558 | |
| 7 | Akamai | 1.5s | 46.2% | 223 | |
| 8 | jsDelivr | 1.7s | 46.8% | 281 | |
| 9 | Bunny CDN | 1.7s | 43.0% | 366 | |
| 10 | cdnjs | 1.8s | 43.4% | 386 | |
| 11 | unpkg | 1.9s | 39.2% | 239 |
The State of Web Vitals · October 2026 · React sites (9,570) · all devices 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 692ms
CloudFront 75.6% 7,234 798ms
Imperva/Incapsula 0.2% 15 882ms
Fastly 81.9% 7,837 877ms
Vercel Edge 1% 93 975ms
Cloudflare 37.2% 3,558 1.3s
Azure CDN 0.3% 32 985ms
jsDelivr 2.9% 281 1.7s
Akamai 2.3% 223 1.5s
cdnjs 4% 386 1.8s
Bunny CDN 3.8% 366 1.7s
unpkg 2.5% 239 1.9s
KeyCDN 0.3% 24 2.4s
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
79% of Google Cloud CDN sites pass TTFB. Unpkg trails 40 points behind, leaving 61% of its sites failing. computed
The State of Web Vitals · October 2026 · React sites (9,570) · all devices 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%
881.9s
96102ms
930.01
851.4s
72877ms
CloudFront 75.6%
891.8s
9699ms
950.01
881.3s
75798ms
Google Cloud CDN 67.5%
921.7s
9695ms
970.00
911.1s
79692ms
Cloudflare 37.2%
782.4s
93120ms
870.03
731.9s
581.3s
cdnjs 4%
633.0s
96129ms
790.09
572.4s
431.8s
Bunny CDN 3.8%
682.8s
93121ms
810.09
622.2s
431.7s
jsDelivr 2.9%
712.7s
86140ms
730.12
632.1s
471.7s
unpkg 2.5%
563.0s
89133ms
750.10
522.5s
391.9s
Akamai 2.3%
762.5s
91136ms
840.05
681.9s
461.5s
Vercel Edge 1%
782.4s
91126ms
790.07
731.9s
66975ms
Netlify Edge 0.8%
842.4s
28726ms
240.32
841.6s
81.2s
Azure CDN 0.3%
872.1s
93125ms
810.04
811.7s
48985ms
KeyCDN 0.3%
583.5s
100145ms
670.14
422.8s
302.4s
Imperva/Incapsula 0.2%
802.3s
100115ms
870.02
871.7s
73882ms
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: 79% of its sites pass. unpkg trails at 39%. computed
The State of Web Vitals · October 2026 · React sites (9,570) · all devices 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.