The State of Web Vitals

Image CDNs impact

Performance impact by image_cdn provider.

Field data PhoneDesktopAll Scope All sites Q2 2026 edition · Desktop field outcomes
Metric LCP INP CLS
1

At a glance the headline numbers for Image CDNs impact

Performance impact by image_cdn provider.

9
Providers ranked
After min-sites filter
27,247
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 80.0%
78
2 Uploadcare 0.08 83.7%
92
3 Imgix 0.08 79.2%
805
4 Akamai Image Manager 0.09 78.2%
7,230
5 Bunny Image Optimizer 0.10 75.8%
17,146
6 Cloudinary 0.11 73.9%
512
7 Fastly Image Optimizer 0.12 70.8%
1,139
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 84% 0.08
ImageKit 0% 78 80% 0.07
imgix 0.4% 805 79% 0.08
Akamai Image Manager 3.8% 7,230 78% 0.09
Bunny Image Optimizer 9% 17,146 76% 0.10
Cloudinary 0.3% 512 74% 0.11
Fastly Image Optimizer 0.6% 1,139 71% 0.12
Thumbor 0.1% 188 63% 0.17
Sirv 0% 57 40% 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
Bunny Image Optimizer 9%
862.0s
9970ms
760.10
811.6s
621.1s
Akamai Image Manager 3.8%
872.0s
9969ms
780.09
841.5s
621.1s
Fastly Image Optimizer 0.6%
822.1s
9986ms
710.12
801.6s
631.2s
imgix 0.4%
921.9s
9782ms
790.08
901.3s
77747ms
Cloudinary 0.3%
802.4s
9794ms
740.11
791.7s
631.1s
Thumbor 0.1%
822.2s
9581ms
630.17
841.5s
70860ms
Uploadcare 0%
932.0s
9795ms
840.08
931.3s
84581ms
ImageKit 0%
692.8s
9791ms
800.07
731.8s
541.2s
Sirv 0%
802.4s
9681ms
400.26
702.0s
361.4s
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.

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 (5) → Font services (4) → Personalization (5) → CDN (15) → Chrome field data from 189,915 sites, representing millions of real page loads · How we measured