1
At a glance the headline numbers for Image CDNs impact
Performance impact by image_cdn provider.
9
Providers ranked
After min-sites filter
30,799
Sites in sample
Combined across all items
0.08
Best CLS (p75)
Uploadcare
The State of Web Vitals · November 2026 · 213,971 crawled sites · desktop field datacorewebvitals.io/state-of-cwv
2
The ranking sorted by CLS at p75, fastest first
| # | Provider | CLS p75 | Passing | Sites | |
|---|---|---|---|---|---|
| 1 | Uploadcare | 0.08 | 83.7% | 103 | |
| 2 | ImageKit | 0.08 | 76.6% | 89 | |
| 3 | Imgix | 0.09 | 78.8% | 873 | |
| 4 | Akamai Image Manager | 0.09 | 78.4% | 8,143 | |
| 5 | Cloudinary | 0.10 | 75.1% | 580 | |
| 6 | Bunny Image Optimizer | 0.10 | 75.9% | 19,425 | |
| 7 | Fastly Image Optimizer | 0.12 | 72.5% | 1,299 | |
| 8 | Thumbor | 0.18 | 62.6% | 222 | |
| 9 | Sirv | 0.25 | 41.9% | 65 |
The State of Web Vitals · November 2026 · 213,971 crawled sites · desktop field datacorewebvitals.io/state-of-cwv
3
Passing CLS per provider which group passes the CLS most often
ProviderSitesPassing CLSp75
Uploadcare 0% 103 0.08
imgix 0.4% 873 0.09
Akamai Image Manager 3.8% 8,143 0.09
ImageKit 0% 89 0.08
Bunny Image Optimizer 9.1% 19,425 0.10
Cloudinary 0.3% 580 0.10
Fastly Image Optimizer 0.6% 1,299 0.12
Thumbor 0.1% 222 0.18
Sirv 0% 65 0.25
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
84% of Uploadcare sites pass CLS. Thumbor trails 21 points behind, leaving 37% of its sites failing. computed
The State of Web Vitals · November 2026 · 213,971 crawled 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
Bunny Image Optimizer 9.1%
862.0s
9970ms
760.10
811.6s
621.1s
Akamai Image Manager 3.8%
872.0s
9969ms
780.09
831.5s
621.1s
Fastly Image Optimizer 0.6%
822.1s
9986ms
730.12
801.5s
631.2s
imgix 0.4%
921.9s
9782ms
790.09
891.3s
76760ms
Cloudinary 0.3%
812.2s
9891ms
750.10
801.6s
631.1s
Thumbor 0.1%
832.2s
9686ms
630.18
841.6s
71859ms
Uploadcare 0%
942.0s
9895ms
840.08
941.2s
86576ms
ImageKit 0%
702.8s
9885ms
770.08
701.8s
561.3s
Sirv 0%
812.4s
9780ms
420.25
712.0s
381.4s
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.
Uploadcare leads on CLS: 84% of its sites pass. Thumbor trails at 63%. computed
The State of Web Vitals · November 2026 · 213,971 crawled sites · desktop field datacorewebvitals.io/state-of-cwv
Related signals Search (6) → Font services (4) → Personalization (6) → CDN (16) → 213,971 crawled sites with Chrome field data, representing millions of real page loads · How we measured
213,971 crawled sites with Chrome field data, representing millions of real page loads. How we measured.