The State of Web Vitals

Image CDNs impact

Performance impact by image_cdn provider.

Field data PhoneDesktopAll Scope All sites Q2 2026 edition · Phone 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
0.02
Best CLS (p75)
Fastly Image Optimizer
The State of Web Vitals · Q2 2026 · 189,915 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 86.6%
1,139
2 ImageKit 0.03 88.2%
78
3 Sirv 0.03 86.7%
57
4 Akamai Image Manager 0.03 86.5%
7,230
5 Bunny Image Optimizer 0.03 87.8%
17,146
6 Imgix 0.05 86.1%
805
7 Uploadcare 0.08 82.1%
92
8 Thumbor 0.11 71.7%
188
9 Cloudinary 0.17 68.7%
512
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
3

Passing CLS per provider which group passes the CLS most often

ProviderSitesPassing CLSp75
ImageKit 0% 78 88% 0.03
Bunny Image Optimizer 9% 17,146 88% 0.03
Sirv 0% 57 87% 0.03
Fastly Image Optimizer 0.6% 1,139 87% 0.02
Akamai Image Manager 3.8% 7,230 87% 0.03
imgix 0.4% 805 86% 0.05
Uploadcare 0% 92 82% 0.08
Thumbor 0.1% 188 72% 0.11
Cloudinary 0.3% 512 69% 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

88% of Bunny Image Optimizer sites pass CLS. Cloudinary trails 19 points behind, leaving 31% of its sites failing. computed

The State of Web Vitals · Q2 2026 · 189,915 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%
812.2s
93133ms
880.03
751.8s
591.2s
Akamai Image Manager 3.8%
792.3s
92136ms
870.03
741.8s
551.2s
Fastly Image Optimizer 0.6%
861.8s
91137ms
870.02
881.4s
77773ms
imgix 0.4%
852.1s
87157ms
860.05
841.5s
75807ms
Cloudinary 0.3%
752.5s
70220ms
690.17
731.9s
551.1s
Thumbor 0.1%
832.2s
89151ms
720.11
781.7s
71900ms
Uploadcare 0%
882.2s
86173ms
820.08
831.5s
80719ms
ImageKit 0%
672.8s
80170ms
880.03
642.0s
541.3s
Sirv 0%
802.5s
95124ms
870.03
602.2s
461.4s
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.

Bunny Image Optimizer leads on CLS: 88% of its sites pass. Cloudinary trails at 69%. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · phone 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