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
2.2s
Best LCP (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 LCP at p75, fastest first
| # | Provider | LCP p75 | Passing | Sites | |
|---|---|---|---|---|---|
| 1 | Google Optimize | 2.2s | 82.2% | 19,960 | |
| 2 | AB Tasty | 2.3s | 77.9% | 109 | |
| 3 | VWO | 2.4s | 77.7% | 433 | |
| 4 | Kameleoon | 2.4s | 77.3% | 112 | |
| 5 | Dynamic Yield | 2.6s | 69.8% | 65 | |
| 6 | Convert | 2.7s | 69.9% | 192 | |
| 7 | Optimizely | 2.8s | 69.4% | 137 | |
| 8 | LaunchDarkly | 3.9s | 48.8% | 131 |
The State of Web Vitals · Q2 2026 · 189,915 sites · all devices field datacorewebvitals.io/state-of-cwv
3
Passing LCP per provider which group passes the LCP most often
ProviderSitesPassing LCPp75
Statsig 0% 2 2.1s
Monetate 0% 26 2.3s
Google Optimize 10.5% 19,960 2.2s
AB Tasty 0.1% 109 2.3s
VWO 0.2% 433 2.4s
Kameleoon 0.1% 112 2.4s
Convert 0.1% 192 2.7s
Dynamic Yield 0% 65 2.6s
Optimizely 0.1% 137 2.8s
LaunchDarkly 0.1% 131 3.9s
Split.io 0% 9 3.3s
Evolv ai 0% 1 2.8s
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
82% of Google Optimize sites pass LCP. LaunchDarkly trails 33 points behind, leaving 51% 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
VWO 0.2%
782.4s
80179ms
840.05
721.9s
551.2s
AB Tasty 0.1%
782.3s
86169ms
720.12
711.9s
61988ms
Statsig 0%
1002.1s
50362ms
1000.02
1001.8s
100514ms
Evolv ai 0%
02.8s
0444ms
00.27
02.4s
01.7s
Google Optimize 10.5%
822.2s
96104ms
860.05
751.8s
551.3s
Convert 0.1%
702.7s
86181ms
800.08
751.8s
561.4s
Kameleoon 0.1%
772.4s
71211ms
710.12
721.9s
531.1s
Dynamic Yield 0%
702.6s
47295ms
630.19
751.8s
61967ms
LaunchDarkly 0.1%
493.9s
76197ms
730.11
492.7s
551.2s
Split.io 0%
333.3s
63226ms
440.34
442.6s
56884ms
Optimizely 0.1%
692.8s
73205ms
800.09
642.2s
461.3s
Monetate 0%
882.3s
71213ms
770.08
771.7s
381.0s
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: 82% of its sites pass. LaunchDarkly trails at 49%. computed
The State of Web Vitals · Q2 2026 · 189,915 sites · all devices 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.