1
At a glance the headline numbers for Image CDNs impact
Performance impact by image_cdn provider.
3
Providers ranked
After min-sites filter
625
Sites in sample
Combined across all items
0.06
Best CLS (p75)
Akamai Image Manager
The State of Web Vitals · October 2026 · React sites (9,570) · phone field datacorewebvitals.io/state-of-cwv
2
The ranking sorted by CLS at p75, fastest first
| # | Provider | CLS p75 | Passing | Sites | |
|---|---|---|---|---|---|
| 1 | Akamai Image Manager | 0.06 | 81.9% | 188 | |
| 2 | Bunny Image Optimizer | 0.07 | 84.5% | 366 | |
| 3 | Cloudinary | 0.33 | 12.1% | 71 |
The State of Web Vitals · October 2026 · React sites (9,570) · phone field datacorewebvitals.io/state-of-cwv
3
Passing CLS per provider which group passes the CLS most often
ProviderSitesPassing CLSp75
imgix 0.3% 27 0.01
Fastly Image Optimizer 0.2% 20 0.06
Bunny Image Optimizer 3.8% 366 0.07
Akamai Image Manager 2% 188 0.06
Cloudinary 0.7% 71 0.33
Good Needs Improvement Poor Sorted best-passing first · median colored by its own rating · pass = good CLS (0.1 at p75) · one value per site
No provider stands out: pass rates sit between 82% and 85%. computed
The State of Web Vitals · October 2026 · React sites (9,570) · 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
Bunny Image Optimizer 3.8%
692.8s
89144ms
850.07
642.3s
451.7s
Akamai Image Manager 2%
692.6s
85162ms
820.06
602.1s
451.6s
Cloudinary 0.7%
782.4s
8791ms
120.33
901.5s
41.2s
imgix 0.3%
891.9s
85113ms
1000.01
891.2s
56960ms
Fastly Image Optimizer 0.2%
931.6s
92135ms
930.06
871.2s
87661ms
60%95%+ passing Cell: pass rate, small number = p75 · faded rows: under 100 sites
One row per provider, 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.
Bunny Image Optimizer leads on CLS: 85% of its sites pass. Akamai Image Manager trails at 82%. computed
The State of Web Vitals · October 2026 · React sites (9,570) · phone field datacorewebvitals.io/state-of-cwv
Related signals Search (6) → Font services (4) → Personalization (6) → CDN (16) → 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.