1
At a glance the headline numbers for Image CDNs impact
Performance impact by image_cdn provider.
9
Providers ranked
After min-sites filter
30,346
Sites in sample
Combined across all items
0.02
Best CLS (p75)
Fastly Image Optimizer
The State of Web Vitals · October 2026 · 210,902 crawled sites · phone field datacorewebvitals.io/state-of-cwv
2
The ranking sorted by CLS at p75, fastest first
| # | Provider | CLS p75 | Passing | Sites | |
|---|---|---|---|---|---|
| 1 | Fastly Image Optimizer | 0.02 | 87.1% | 1,282 | |
| 2 | Sirv | 0.02 | 88.2% | 65 | |
| 3 | ImageKit | 0.03 | 86.7% | 88 | |
| 4 | Akamai Image Manager | 0.03 | 86.5% | 8,026 | |
| 5 | Bunny Image Optimizer | 0.03 | 87.8% | 19,121 | |
| 6 | Imgix | 0.05 | 85.1% | 866 | |
| 7 | Uploadcare | 0.08 | 83.8% | 102 | |
| 8 | Thumbor | 0.11 | 72.2% | 219 | |
| 9 | Cloudinary | 0.16 | 69.8% | 577 |
The State of Web Vitals · October 2026 · 210,902 crawled sites · phone field datacorewebvitals.io/state-of-cwv
3
Passing CLS per provider which group passes the CLS most often
ProviderSitesPassing CLSp75
Sirv 0% 65 0.02
Bunny Image Optimizer 9.1% 19,121 0.03
Fastly Image Optimizer 0.6% 1,282 0.02
ImageKit 0% 88 0.03
Akamai Image Manager 3.8% 8,026 0.03
imgix 0.4% 866 0.05
Uploadcare 0% 102 0.08
Thumbor 0.1% 219 0.11
Cloudinary 0.3% 577 0.16
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
88% of Bunny Image Optimizer sites pass CLS. Cloudinary trails 18 points behind, leaving 30% of its sites failing. computed
The State of Web Vitals · October 2026 · 210,902 crawled sites · 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 9.1%
812.2s
93133ms
880.03
751.8s
591.2s
Akamai Image Manager 3.8%
792.3s
92137ms
870.03
741.8s
551.2s
Fastly Image Optimizer 0.6%
851.9s
90137ms
870.02
871.4s
77780ms
imgix 0.4%
842.1s
86161ms
850.05
841.5s
74830ms
Cloudinary 0.3%
772.4s
72216ms
700.16
741.8s
551.1s
Thumbor 0.1%
822.3s
87155ms
720.11
781.7s
72872ms
Uploadcare 0%
892.1s
85183ms
840.08
841.5s
82714ms
ImageKit 0%
672.7s
81160ms
870.03
612.1s
551.3s
Sirv 0%
822.4s
95123ms
880.02
652.1s
511.3s
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: 88% of its sites pass. Cloudinary trails at 70%. computed
The State of Web Vitals · October 2026 · 210,902 crawled sites · 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.