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
0.03
Best CLS (p75)
Imgix
The State of Web Vitals · October 2026 · WordPress sites (63,295) · all devices field datacorewebvitals.io/state-of-cwv
2
The ranking sorted by CLS at p75, fastest first
| # | Provider | CLS p75 | Passing | Sites | |
|---|---|---|---|---|---|
| 1 | Imgix | 0.03 | 90.1% | 92 | |
| 2 | Akamai Image Manager | 0.04 | 86.8% | 2,234 | |
| 3 | Fastly Image Optimizer | 0.05 | 82.0% | 61 | |
| 4 | Bunny Image Optimizer | 0.05 | 86.6% | 5,212 |
The State of Web Vitals · October 2026 · WordPress sites (63,295) · all devices field datacorewebvitals.io/state-of-cwv
3
Passing CLS per provider which group passes the CLS most often
ProviderSitesPassing CLSp75
imgix 0.1% 92 0.03
ImageKit 0% 8 0.02
Akamai Image Manager 3.5% 2,234 0.04
Bunny Image Optimizer 8.2% 5,212 0.05
Sirv 0% 6 0.02
Fastly Image Optimizer 0.1% 61 0.05
Cloudinary 0.1% 42 0.04
Thumbor 0% 11 0.17
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 87% and 87%. computed
The State of Web Vitals · October 2026 · WordPress sites (63,295) · all devices 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%
682.8s
98107ms
870.05
582.3s
311.9s
Akamai Image Manager 3.5%
702.7s
99105ms
870.04
602.2s
321.8s
imgix 0.1%
692.9s
99106ms
900.03
552.5s
301.9s
Fastly Image Optimizer 0.1%
662.7s
94117ms
820.05
572.5s
291.9s
Cloudinary 0.1%
553.2s
97116ms
810.04
562.3s
312.2s
Thumbor 0%
442.9s
100113ms
670.17
442.5s
221.9s
ImageKit 0%
752.4s
100145ms
880.02
632.0s
141.5s
Sirv 0%
832.5s
100121ms
830.02
672.3s
171.6s
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: 87% of its sites pass. Akamai Image Manager trails at 87%. computed
The State of Web Vitals · October 2026 · WordPress sites (63,295) · all devices 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.