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
21,139
Sites in sample
Combined across all items
125ms
Best INP (p75)
Google Optimize
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
2
The ranking sorted by INP at p75, fastest first
| # | Provider | INP p75 | Passing | Sites | |
|---|---|---|---|---|---|
| 1 | Google Optimize | 125ms | 93.5% | 19,960 | |
| 2 | AB Tasty | 194ms | 75.6% | 109 | |
| 3 | Convert | 196ms | 77.1% | 192 | |
| 4 | VWO | 204ms | 73.5% | 433 | |
| 5 | Optimizely | 239ms | 61.0% | 137 | |
| 6 | Kameleoon | 241ms | 62.0% | 112 | |
| 7 | LaunchDarkly | 254ms | 66.7% | 131 | |
| 8 | Dynamic Yield | 320ms | 39.6% | 65 |
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
3
Passing INP per provider which group passes the INP most often
ProviderSitesPassing INPp75
Google Optimize 10.5% 19,960 125ms
Convert 0.1% 192 196ms
AB Tasty 0.1% 109 194ms
VWO 0.2% 433 204ms
LaunchDarkly 0.1% 131 254ms
Kameleoon 0.1% 112 241ms
Optimizely 0.1% 137 239ms
Statsig 0% 2 402ms
Split.io 0% 9 295ms
Monetate 0% 26 230ms
Dynamic Yield 0% 65 320ms
Evolv ai 0% 1 494ms
Good Needs Improvement Poor Sorted best-passing first · median colored by its own rating · pass = good INP (200ms at p75) · one value per site
94% of Google Optimize sites pass INP. Optimizely trails 33 points behind, leaving 39% 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
VWO 0.2%
762.4s
74204ms
830.05
692.0s
531.3s
AB Tasty 0.1%
782.3s
76194ms
720.12
731.8s
56933ms
Statsig 0%
1002.2s
50402ms
1000.02
502.0s
100540ms
Evolv ai 0%
02.8s
0494ms
00.26
02.4s
01.7s
Google Optimize 10.5%
812.3s
94125ms
870.03
731.9s
541.3s
Convert 0.1%
662.7s
77196ms
800.07
692.1s
511.5s
Kameleoon 0.1%
772.5s
62241ms
770.07
701.9s
531.1s
Dynamic Yield 0%
652.7s
40320ms
640.22
712.0s
631.1s
LaunchDarkly 0.1%
454.1s
67254ms
710.13
453.0s
541.2s
Split.io 0%
573.6s
50295ms
430.22
432.9s
571.5s
Optimizely 0.1%
682.9s
61239ms
780.09
612.2s
441.2s
Monetate 0%
782.4s
45230ms
780.07
701.9s
391.1s
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.
Google Optimize leads on INP: 94% of its sites pass. Optimizely trails at 61%. computed
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
Related signals Maps (4) → CDN (16) → Chat & messaging (17) → Bot detection (8) → 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.