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
2.0s
Best LCP (p75)
Kameleoon
The State of Web Vitals · Q1 2026 · 94,910 sites · desktop field datacorewebvitals.io/state-of-cwv
2
The ranking sorted by LCP at p75, fastest first
| # | Provider | LCP p75 | Passing | Sites | |
|---|---|---|---|---|---|
| 1 | Kameleoon | 2.0s | 83.6% | 60 | |
| 2 | Google Optimize | 2.0s | 85.8% | 10,546 | |
| 3 | AB Tasty | 2.1s | 77.3% | 53 | |
| 4 | VWO | 2.3s | 79.6% | 246 | |
| 5 | Convert | 2.5s | 75.6% | 105 | |
| 6 | Optimizely | 2.8s | 70.3% | 82 | |
| 7 | LaunchDarkly | 3.5s | 54.8% | 76 |
The State of Web Vitals · Q1 2026 · 94,910 sites · desktop field datacorewebvitals.io/state-of-cwv
3
Passing LCP per provider which group passes the LCP most often
ProviderSitesPassing LCPp75
Google Optimize 11.1% 10,546 2.0s
Monetate 0% 13 2.1s
Kameleoon 0.1% 60 2.0s
VWO 0.3% 246 2.3s
AB Tasty 0.1% 53 2.1s
Convert 0.1% 105 2.5s
Optimizely 0.1% 82 2.8s
Dynamic Yield 0% 37 2.7s
Split.io 0% 5 2.7s
LaunchDarkly 0.1% 76 3.5s
Good Needs Improvement Poor Sorted best-passing first · median colored by its own rating · pass = good LCP (2.5s at p75) · one value per site
86% of Google Optimize sites pass LCP. Convert trails 10 points behind. computed
The State of Web Vitals · Q1 2026 · 94,910 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
Google Optimize 11.1%
862.0s
9961ms
760.10
811.6s
591.2s
VWO 0.3%
802.3s
9896ms
790.09
771.7s
521.1s
Convert 0.1%
762.5s
100101ms
660.15
722.0s
601.5s
Optimizely 0.1%
702.8s
89122ms
680.15
731.9s
601.1s
LaunchDarkly 0.1%
553.5s
81127ms
640.23
582.7s
75786ms
Kameleoon 0.1%
842.0s
94117ms
800.09
861.6s
491.1s
AB Tasty 0.1%
772.1s
9895ms
640.15
801.5s
72815ms
Dynamic Yield 0%
702.7s
82195ms
600.19
671.9s
571.4s
Monetate 0%
852.1s
100119ms
850.06
851.7s
461.4s
Split.io 0%
672.7s
67185ms
330.43
671.6s
100324ms
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 LCP: 86% of its sites pass. Convert trails at 76%. computed
The State of Web Vitals · Q1 2026 · 94,910 sites · desktop 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.