The State of Web Vitals

A/B testing impact

Performance impact by ab_testing provider.

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

At a glance the headline numbers for A/B testing impact

Performance impact by ab_testing provider.

8
Providers ranked
After min-sites filter
21,106
Sites in sample
Combined across all items
104ms
Best INP (p75)
Google Optimize
The State of Web Vitals · Q2 2026 · 189,915 sites · all devices field datacorewebvitals.io/state-of-cwv
2

The ranking sorted by INP at p75, fastest first

# Provider INP p75 Passing Sites
1 Google Optimize 104ms 95.9%
19,928
2 AB Tasty 169ms 85.9%
109
3 VWO 179ms 80.3%
433
4 Convert 182ms 86.3%
191
5 LaunchDarkly 197ms 75.7%
131
6 Optimizely 205ms 73.0%
137
7 Kameleoon 210ms 70.8%
112
8 Dynamic Yield 295ms 47.2%
65
The State of Web Vitals · Q2 2026 · 189,915 sites · all devices field datacorewebvitals.io/state-of-cwv
3

Passing INP per provider which group passes the INP most often

ProviderSitesPassing INPp75
Google Optimize 10.5% 19,928 96% 104ms
Convert 0.1% 191 86% 182ms
AB Tasty 0.1% 109 86% 169ms
VWO 0.2% 433 80% 179ms
LaunchDarkly 0.1% 131 76% 197ms
Optimizely 0.1% 137 73% 205ms
Kameleoon 0.1% 112 71% 210ms
Monetate 0% 26 71% 214ms
Split.io 0% 9 63% 267ms
Dynamic Yield 0% 65 47% 295ms
Good Needs Improvement Poor Sorted best-passing first · median colored by its own rating · pass = good INP (200ms at p75) · one value per site

96% of Google Optimize sites pass INP. Kameleoon trails 25 points behind, leaving 29% of its sites failing. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · all devices 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
Google Optimize 10.5%
822.2s
96104ms
860.05
751.8s
551.3s
VWO 0.2%
782.4s
80179ms
840.05
721.9s
551.2s
Convert 0.1%
702.7s
86182ms
800.08
751.9s
551.4s
Optimizely 0.1%
692.7s
73205ms
800.09
642.2s
461.3s
LaunchDarkly 0.1%
493.9s
76197ms
730.11
492.7s
551.2s
Kameleoon 0.1%
772.4s
71210ms
710.12
721.9s
531.1s
AB Tasty 0.1%
782.3s
86169ms
720.12
711.9s
61988ms
Dynamic Yield 0%
702.6s
47295ms
640.19
751.8s
61967ms
Monetate 0%
892.3s
71214ms
770.08
771.7s
391.0s
Split.io 0%
333.3s
63267ms
440.34
442.6s
56884ms
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.

Google Optimize leads on INP: 96% of its sites pass. Kameleoon trails at 71%. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · all devices field datacorewebvitals.io/state-of-cwv
Related signals Maps (4) → CDN (15) → Chat & messaging (17) → Bot detection (7) → Chrome field data from 189,915 sites, representing millions of real page loads · How we measured