1
At a glance the headline numbers for Image CDNs impact
Performance impact by image_cdn provider.
4
Providers ranked
After min-sites filter
7,599
Sites in sample
Combined across all items
0.08
Best CLS (p75)
Akamai Image Manager
The State of Web Vitals · October 2026 · WordPress sites (63,295) · desktop 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 | 0.08 | 80.7% | 2,234 | |
| 2 | Bunny Image Optimizer | 0.10 | 75.3% | 5,212 | |
| 3 | Fastly Image Optimizer | 0.10 | 75.0% | 61 | |
| 4 | Imgix | 0.12 | 72.7% | 92 |
The State of Web Vitals · October 2026 · WordPress sites (63,295) · desktop field datacorewebvitals.io/state-of-cwv
3
Passing CLS per provider which group passes the CLS most often
ProviderSitesPassing CLSp75
Thumbor 0% 11 0.03
Cloudinary 0.1% 42 0.10
Akamai Image Manager 3.5% 2,234 0.08
Bunny Image Optimizer 8.2% 5,212 0.10
Fastly Image Optimizer 0.1% 61 0.10
ImageKit 0% 8 0.09
Sirv 0% 6 0.16
imgix 0.1% 92 0.12
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
81% of Akamai Image Manager sites pass CLS. Bunny Image Optimizer trails 6 points behind. 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
Bunny Image Optimizer 8.2%
732.6s
9965ms
750.10
642.2s
331.8s
Akamai Image Manager 3.5%
772.4s
10062ms
810.08
691.9s
361.7s
imgix 0.1%
832.1s
10064ms
730.12
681.9s
441.5s
Fastly Image Optimizer 0.1%
732.5s
9581ms
750.10
572.2s
261.7s
Cloudinary 0.1%
632.6s
10063ms
850.10
652.0s
331.6s
Thumbor 0%
802.0s
10049ms
1000.03
601.8s
501.4s
ImageKit 0%
672.7s
10085ms
750.09
502.0s
01.6s
Sirv 0%
502.9s
10056ms
750.16
502.5s
252.0s
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.
Akamai Image Manager leads on CLS: 81% of its sites pass. Bunny Image Optimizer trails at 75%. computed
The State of Web Vitals · October 2026 · WordPress sites (63,295) · desktop field datacorewebvitals.io/state-of-cwv
Related signals Search (6) → Font services (4) → Personalization (6) → CDN (16) → 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.