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
1.5s
Best TTFB (p75)
Imperva/Incapsula
The State of Web Vitals · October 2026 · WordPress sites (63,295) · 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 | Imperva/Incapsula | 1.5s | 44.4% | 65 | |
| 2 | jsDelivr | 1.8s | 30.2% | 3,345 | |
| 3 | Fastly | 1.8s | 31.2% | 23,146 | |
| 4 | Akamai | 1.8s | 30.5% | 2,240 | |
| 5 | Cloudflare | 1.9s | 31.2% | 26,661 | |
| 6 | Google Cloud CDN | 1.9s | 32.1% | 4,408 | |
| 7 | Bunny CDN | 1.9s | 30.4% | 5,227 | |
| 8 | CloudFront | 1.9s | 29.5% | 13,885 | |
| 9 | cdnjs | 1.9s | 30.1% | 4,956 | |
| 10 | Azure CDN | 2.0s | 30.7% | 109 | |
| 11 | Vercel Edge | 2.0s | 34.0% | 322 | |
| 12 | unpkg | 2.0s | 24.0% | 1,999 | |
| 13 | Sucuri | 2.1s | 19.4% | 96 | |
| 14 | Netlify Edge | 2.2s | 25.0% | 165 | |
| 15 | KeyCDN | 2.3s | 18.7% | 275 |
The State of Web Vitals · October 2026 · WordPress sites (63,295) · phone 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 1.5s
Vercel Edge 0.5% 322 2.0s
Google Cloud CDN 7% 4,408 1.9s
Cloudflare 42.1% 26,661 1.9s
Fastly 36.6% 23,146 1.8s
Azure CDN 0.2% 109 2.0s
Akamai 3.5% 2,240 1.8s
Bunny CDN 8.3% 5,227 1.9s
jsDelivr 5.3% 3,345 1.8s
cdnjs 7.8% 4,956 1.9s
CloudFront 21.9% 13,885 1.9s
Netlify Edge 0.3% 165 2.2s
unpkg 3.2% 1,999 2.0s
Sucuri 0.2% 96 2.1s
KeyCDN 0.4% 275 2.3s
Good Needs Improvement Poor Sorted best-passing first · median colored by its own rating · pass = good TTFB (800ms at p75) · one value per site
34% of Vercel Edge sites pass TTFB. KeyCDN trails 15 points behind, leaving 81% of its sites failing. computed
The State of Web Vitals · October 2026 · WordPress sites (63,295) · phone 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%
672.8s
96127ms
890.02
552.4s
311.9s
Fastly 36.6%
672.8s
95129ms
870.03
562.4s
311.8s
CloudFront 21.9%
652.9s
95134ms
860.04
532.4s
301.9s
Bunny CDN 8.3%
662.9s
96125ms
890.02
552.4s
301.9s
cdnjs 7.8%
642.9s
97127ms
880.02
532.5s
301.9s
Google Cloud CDN 7%
652.9s
94138ms
860.04
552.5s
321.9s
jsDelivr 5.3%
692.7s
96128ms
890.02
582.3s
301.8s
Akamai 3.5%
662.8s
97126ms
880.02
562.3s
311.8s
unpkg 3.2%
632.9s
94134ms
880.02
492.6s
242.0s
Vercel Edge 0.5%
643.0s
94141ms
780.07
552.5s
342.0s
KeyCDN 0.4%
543.2s
100116ms
890.02
422.8s
192.3s
Netlify Edge 0.3%
622.9s
94137ms
780.10
512.6s
252.2s
Azure CDN 0.2%
662.8s
87157ms
960.01
522.6s
312.0s
Sucuri 0.2%
623.1s
100122ms
890.03
442.8s
192.1s
Imperva/Incapsula 0.1%
802.3s
97129ms
900.06
701.9s
441.5s
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.
Vercel Edge leads on TTFB: 34% of its sites pass. KeyCDN trails at 19%. computed
The State of Web Vitals · October 2026 · WordPress sites (63,295) · phone 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.