1
At a glance the headline numbers for Image CDNs impact
Performance impact by image_cdn provider.
9
Providers ranked
After min-sites filter
27,273
Sites in sample
Combined across all items
0.07
Best CLS (p75)
ImageKit
The State of Web Vitals · Q2 2026 · 189,915 sites · desktop field datacorewebvitals.io/state-of-cwv
2
The ranking sorted by CLS at p75, fastest first
| # | Provider | CLS p75 | Passing | Sites | |
|---|---|---|---|---|---|
| 1 | ImageKit | 0.07 | 80.5% | 79 | |
| 2 | Imgix | 0.08 | 79.2% | 805 | |
| 3 | Uploadcare | 0.08 | 83.7% | 92 | |
| 4 | Akamai Image Manager | 0.09 | 78.2% | 7,236 | |
| 5 | Bunny Image Optimizer | 0.10 | 75.8% | 17,162 | |
| 6 | Cloudinary | 0.11 | 73.9% | 512 | |
| 7 | Fastly Image Optimizer | 0.12 | 70.8% | 1,142 | |
| 8 | Thumbor | 0.17 | 62.5% | 188 | |
| 9 | Sirv | 0.26 | 40.0% | 57 |
The State of Web Vitals · Q2 2026 · 189,915 sites · desktop field datacorewebvitals.io/state-of-cwv
3
Passing CLS per provider which group passes the CLS most often
ProviderSitesPassing CLSp75
Uploadcare 0% 92 0.08
ImageKit 0% 79 0.07
imgix 0.4% 805 0.08
Akamai Image Manager 3.8% 7,236 0.09
Bunny Image Optimizer 9% 17,162 0.10
Cloudinary 0.3% 512 0.11
Fastly Image Optimizer 0.6% 1,142 0.12
Thumbor 0.1% 188 0.17
Sirv 0% 57 0.26
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
79% of imgix sites pass CLS. Thumbor trails 16 points behind, leaving 37% of its sites failing. computed
The State of Web Vitals · Q2 2026 · 189,915 sites · 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
ImageKit 0%
702.8s
9793ms
800.07
731.8s
541.3s
Sirv 0%
802.4s
9680ms
400.26
702.0s
361.4s
Akamai Image Manager 3.8%
872.0s
9969ms
780.09
841.5s
621.1s
Bunny Image Optimizer 9%
862.0s
9970ms
760.10
811.6s
621.1s
imgix 0.4%
921.9s
9782ms
790.08
901.3s
77748ms
Thumbor 0.1%
822.2s
9582ms
630.17
841.5s
70860ms
Fastly Image Optimizer 0.6%
822.1s
9986ms
710.12
801.5s
631.2s
Uploadcare 0%
932.0s
9795ms
840.08
931.3s
84587ms
Cloudinary 0.3%
802.4s
9794ms
740.11
791.7s
631.1s
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.
imgix leads on CLS: 79% of its sites pass. Thumbor trails at 63%. computed
The State of Web Vitals · Q2 2026 · 189,915 sites · desktop field datacorewebvitals.io/state-of-cwv
Related signals Search (6) → Font services (4) → Personalization (6) → CDN (16) → Chrome field data from 189,915 sites, representing millions of real page loads · How we measured
Chrome field data from 189,915 sites, representing millions of real page loads. How we measured.