CDN impact WordPress sites
Time to first byte by CDN provider, measured in real-user Chrome data.
1
At a glance the headline numbers for CDN impact
Time to first byte by CDN provider, measured in real-user Chrome data.
15
Providers ranked
After min-sites filter
86,899
Sites in sample
Combined across all items
1.4s
Best TTFB (p75)
Imperva/Incapsula
The State of Web Vitals · October 2026 · WordPress sites (63,295) · 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 | Imperva/Incapsula | 1.4s | 48.0% | 65 | |
| 2 | jsDelivr | 1.7s | 35.4% | 3,345 | |
| 3 | Azure CDN | 1.7s | 38.8% | 109 | |
| 4 | Vercel Edge | 1.7s | 36.0% | 322 | |
| 5 | Akamai | 1.7s | 36.1% | 2,240 | |
| 6 | Fastly | 1.8s | 34.4% | 23,146 | |
| 7 | Cloudflare | 1.8s | 33.8% | 26,661 | |
| 8 | Bunny CDN | 1.8s | 33.0% | 5,227 | |
| 9 | cdnjs | 1.8s | 33.3% | 4,956 | |
| 10 | Google Cloud CDN | 1.8s | 33.3% | 4,408 | |
| 11 | CloudFront | 1.8s | 31.6% | 13,885 | |
| 12 | KeyCDN | 1.8s | 16.9% | 275 | |
| 13 | unpkg | 2.0s | 30.2% | 1,999 | |
| 14 | Netlify Edge | 2.1s | 33.3% | 165 | |
| 15 | Sucuri | 2.2s | 25.9% | 96 |
The State of Web Vitals · October 2026 · WordPress sites (63,295) · desktop field datacorewebvitals.io/state-of-cwv
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Passing TTFB per CDN which group passes the TTFB most often
CDNSitesPassing TTFBp75
Imperva/Incapsula 0.1% 65 1.4s
Azure CDN 0.2% 109 1.7s
Akamai 3.5% 2,240 1.7s
Vercel Edge 0.5% 322 1.7s
jsDelivr 5.3% 3,345 1.7s
Fastly 36.6% 23,146 1.8s
Cloudflare 42.1% 26,661 1.8s
cdnjs 7.8% 4,956 1.8s
Google Cloud CDN 7% 4,408 1.8s
Netlify Edge 0.3% 165 2.1s
Bunny CDN 8.3% 5,227 1.8s
CloudFront 21.9% 13,885 1.8s
unpkg 3.2% 1,999 2.0s
Sucuri 0.2% 96 2.2s
KeyCDN 0.4% 275 1.8s
Good Needs Improvement Poor Sorted best-passing first · median colored by its own rating · pass = good TTFB (800ms at p75) · one value per site
39% of Azure CDN sites pass TTFB. KeyCDN trails 22 points behind, leaving 83% of its sites failing. computed
The State of Web Vitals · October 2026 · WordPress sites (63,295) · desktop field datacorewebvitals.io/state-of-cwv
4
All five vitals at once the whole category without toggling - cell is the pass rate, small number the p75
LCP
INP
CLS
FCP
TTFB
Cloudflare 42.1%
742.5s
10063ms
770.10
652.1s
341.8s
Fastly 36.6%
742.6s
10065ms
760.10
662.1s
341.8s
CloudFront 21.9%
722.6s
10066ms
750.11
632.2s
321.8s
Bunny CDN 8.3%
732.6s
9965ms
750.10
642.2s
331.8s
cdnjs 7.8%
722.6s
10063ms
760.10
632.2s
331.8s
Google Cloud CDN 7%
722.6s
10068ms
750.11
632.2s
331.8s
jsDelivr 5.3%
762.5s
10063ms
800.09
672.0s
351.7s
Akamai 3.5%
772.4s
10062ms
810.08
691.9s
361.7s
unpkg 3.2%
682.8s
9966ms
760.10
572.4s
302.0s
Vercel Edge 0.5%
762.4s
10070ms
680.13
662.0s
361.7s
KeyCDN 0.4%
702.6s
10061ms
660.12
642.1s
171.8s
Netlify Edge 0.3%
662.8s
10071ms
770.10
572.5s
332.1s
Azure CDN 0.2%
822.3s
9883ms
780.09
682.0s
391.7s
Sucuri 0.2%
613.2s
10057ms
750.10
532.7s
262.2s
Imperva/Incapsula 0.1%
802.3s
10063ms
770.10
732.0s
481.4s
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.
Azure CDN leads on TTFB: 39% of its sites pass. KeyCDN trails at 17%. computed
The State of Web Vitals · October 2026 · WordPress sites (63,295) · desktop field datacorewebvitals.io/state-of-cwv
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Related signals Marketing pixels (10) → Bot detection (8) → Forms (4) → Personalization (6) → 203,892 crawled sites with Chrome field data, representing millions of real page loads · How we measured
203,892 crawled sites with Chrome field data, representing millions of real page loads. How we measured.