1
At a glance the headline numbers for A/B testing impact
Performance impact by ab_testing provider.
7
Providers ranked
After min-sites filter
11,168
Sites in sample
Combined across all items
126ms
Best INP (p75)
Google Optimize
The State of Web Vitals · Q1 2026 · 94,910 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 | 126ms | 93.4% | 10,546 | |
| 2 | Convert | 196ms | 77.7% | 105 | |
| 3 | AB Tasty | 198ms | 74.4% | 53 | |
| 4 | VWO | 204ms | 73.8% | 246 | |
| 5 | Optimizely | 252ms | 64.3% | 82 | |
| 6 | Kameleoon | 254ms | 56.6% | 60 | |
| 7 | LaunchDarkly | 258ms | 62.5% | 76 |
The State of Web Vitals · Q1 2026 · 94,910 sites · phone field datacorewebvitals.io/state-of-cwv
3
Passing INP per provider which group passes the INP most often
ProviderSitesPassing INPp75
Split.io 0% 5 150ms
Google Optimize 11.1% 10,546 126ms
Convert 0.1% 105 196ms
AB Tasty 0.1% 53 198ms
VWO 0.3% 246 204ms
Monetate 0% 13 194ms
Optimizely 0.1% 82 252ms
LaunchDarkly 0.1% 76 258ms
Kameleoon 0.1% 60 254ms
Dynamic Yield 0% 37 310ms
Good Needs Improvement Poor Sorted best-passing first · median colored by its own rating · pass = good INP (200ms at p75) · one value per site
93% of Google Optimize sites pass INP. VWO trails 19 points behind, leaving 26% of its sites failing. computed
The State of Web Vitals · Q1 2026 · 94,910 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
Google Optimize 11.1%
812.2s
93126ms
870.03
741.8s
541.2s
VWO 0.3%
772.4s
74204ms
830.05
721.9s
511.2s
Convert 0.1%
662.7s
78196ms
780.09
712.0s
521.5s
Optimizely 0.1%
652.9s
64252ms
760.09
612.1s
491.2s
LaunchDarkly 0.1%
483.9s
63258ms
690.15
463.0s
561.1s
Kameleoon 0.1%
762.5s
57254ms
760.07
721.8s
481.2s
AB Tasty 0.1%
792.2s
74198ms
720.12
771.7s
60911ms
Dynamic Yield 0%
593.0s
41310ms
630.17
662.1s
531.3s
Monetate 0%
732.4s
70194ms
820.05
821.7s
46943ms
Split.io 0%
672.9s
100150ms
330.16
672.3s
100559ms
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: 93% of its sites pass. VWO trails at 74%. computed
The State of Web Vitals · Q1 2026 · 94,910 sites · phone field datacorewebvitals.io/state-of-cwv
Related signals Maps (4) → CDN (15) → Chat & messaging (16) → Bot detection (7) → Chrome field data from 94,910 sites, representing millions of real page loads · How we measured
Chrome field data from 94,910 sites, representing millions of real page loads. How we measured.