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
2.0s
Best LCP (p75)
Google Optimize
The State of Web Vitals · Q2 2026 · 189,915 sites · desktop field datacorewebvitals.io/state-of-cwv
2
The ranking sorted by LCP at p75, fastest first
| # | Provider | LCP p75 | Passing | Sites | |
|---|---|---|---|---|---|
| 1 | Google Optimize | 2.0s | 85.4% | 19,960 | |
| 2 | AB Tasty | 2.1s | 83.5% | 109 | |
| 3 | Kameleoon | 2.1s | 82.4% | 112 | |
| 4 | Dynamic Yield | 2.2s | 78.0% | 65 | |
| 5 | VWO | 2.3s | 81.6% | 433 | |
| 6 | Convert | 2.5s | 74.0% | 192 | |
| 7 | Optimizely | 2.7s | 73.2% | 137 | |
| 8 | LaunchDarkly | 3.3s | 54.4% | 131 |
The State of Web Vitals · Q2 2026 · 189,915 sites · desktop field datacorewebvitals.io/state-of-cwv
3
Passing LCP per provider which group passes the LCP most often
ProviderSitesPassing LCPp75
Statsig 0% 2 1.6s
Evolv ai 0% 1 2.4s
Google Optimize 10.5% 19,960 2.0s
Monetate 0% 26 2.1s
AB Tasty 0.1% 109 2.1s
Kameleoon 0.1% 112 2.1s
VWO 0.2% 433 2.3s
Dynamic Yield 0% 65 2.2s
Convert 0.1% 192 2.5s
Optimizely 0.1% 137 2.7s
LaunchDarkly 0.1% 131 3.3s
Split.io 0% 9 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
85% of Google Optimize sites pass LCP. LaunchDarkly trails 31 points behind, leaving 46% of its sites failing. computed
The State of Web Vitals · Q2 2026 · 189,915 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
VWO 0.2%
822.3s
9896ms
780.10
771.7s
541.2s
AB Tasty 0.1%
842.1s
9793ms
700.13
841.5s
71870ms
Statsig 0%
1001.6s
100171ms
1000.02
1001.2s
100397ms
Evolv ai 0%
1002.4s
0242ms
00.34
01.9s
01.5s
Google Optimize 10.5%
852.0s
9961ms
760.10
811.6s
581.2s
Convert 0.1%
742.5s
99109ms
700.12
702.0s
561.5s
Kameleoon 0.1%
822.1s
95117ms
730.12
851.6s
521.1s
Dynamic Yield 0%
782.2s
83195ms
640.13
761.5s
681.0s
LaunchDarkly 0.1%
543.3s
81129ms
640.28
572.5s
73826ms
Split.io 0%
333.5s
80128ms
500.36
332.6s
672.1s
Optimizely 0.1%
732.7s
92122ms
700.13
751.8s
591.2s
Monetate 0%
852.1s
96135ms
770.08
921.6s
621.1s
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 LCP: 85% of its sites pass. LaunchDarkly trails at 54%. computed
The State of Web Vitals · Q2 2026 · 189,915 sites · desktop 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.