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
22,540
Sites in sample
Combined across all items
2.0s
Best LCP (p75)
Google Optimize
The State of Web Vitals · October 2026 · 212,308 crawled 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 | 85.5% | 21,232 | |
| 2 | Kameleoon | 2.1s | 82.4% | 130 | |
| 3 | AB Tasty | 2.1s | 81.8% | 118 | |
| 4 | Dynamic Yield | 2.2s | 79.6% | 69 | |
| 5 | VWO | 2.3s | 81.7% | 480 | |
| 6 | Convert | 2.5s | 75.8% | 211 | |
| 7 | Optimizely | 2.7s | 73.6% | 157 | |
| 8 | LaunchDarkly | 3.3s | 56.0% | 143 |
The State of Web Vitals · October 2026 · 212,308 crawled sites · desktop field datacorewebvitals.io/state-of-cwv
3
Passing LCP per provider which group passes the LCP most often
ProviderSitesPassing LCPp75
Google Optimize 10% 21,232 2.0s
Monetate 0% 28 2.1s
Kameleoon 0.1% 130 2.1s
AB Tasty 0.1% 118 2.1s
VWO 0.2% 480 2.3s
Dynamic Yield 0% 69 2.2s
Convert 0.1% 211 2.5s
Optimizely 0.1% 157 2.7s
LaunchDarkly 0.1% 143 3.3s
Split.io 0% 9 3.4s
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. LaunchDarkly trails 30 points behind, leaving 44% of its sites failing. computed
The State of Web Vitals · October 2026 · 212,308 crawled 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 10%
862.0s
9962ms
760.10
811.6s
581.2s
VWO 0.2%
822.3s
9897ms
780.10
771.7s
561.2s
Convert 0.1%
762.5s
98105ms
730.11
732.0s
591.4s
Optimizely 0.1%
742.7s
92122ms
680.14
761.8s
611.1s
LaunchDarkly 0.1%
563.3s
82127ms
660.28
582.6s
72873ms
Kameleoon 0.1%
822.1s
95117ms
720.12
851.6s
541.1s
AB Tasty 0.1%
822.1s
9695ms
720.11
831.5s
70903ms
Dynamic Yield 0%
802.2s
84178ms
650.13
781.5s
70901ms
Monetate 0%
852.1s
96135ms
780.07
931.6s
631.1s
Split.io 0%
333.4s
80128ms
500.32
332.6s
671.8s
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. LaunchDarkly trails at 56%. computed
The State of Web Vitals · October 2026 · 212,308 crawled sites · desktop field datacorewebvitals.io/state-of-cwv
Related signals Maps (4) → CDN (16) → Chat & messaging (17) → Bot detection (8) → 212,308 crawled sites with Chrome field data, representing millions of real page loads · How we measured
212,308 crawled sites with Chrome field data, representing millions of real page loads. How we measured.