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
22,448
Sites in sample
Combined across all items
2.3s
Best LCP (p75)
Google Optimize
The State of Web Vitals · October 2026 · 210,902 crawled sites · phone field datacorewebvitals.io/state-of-cwv
2
The ranking sorted by LCP at p75, fastest first
| # | Provider | LCP p75 | Passing | Sites | |
|---|---|---|---|---|---|
| 1 | Google Optimize | 2.3s | 80.7% | 21,150 | |
| 2 | AB Tasty | 2.4s | 76.3% | 117 | |
| 3 | VWO | 2.4s | 76.7% | 475 | |
| 4 | Kameleoon | 2.5s | 75.8% | 129 | |
| 5 | Dynamic Yield | 2.7s | 67.8% | 69 | |
| 6 | Convert | 2.7s | 69.1% | 210 | |
| 7 | Optimizely | 2.9s | 66.4% | 157 | |
| 8 | LaunchDarkly | 4.0s | 47.3% | 141 |
The State of Web Vitals · October 2026 · 210,902 crawled sites · phone field datacorewebvitals.io/state-of-cwv
3
Passing LCP per provider which group passes the LCP most often
ProviderSitesPassing LCPp75
Google Optimize 10% 21,150 2.3s
Monetate 0% 28 2.4s
VWO 0.2% 475 2.4s
AB Tasty 0.1% 117 2.4s
Kameleoon 0.1% 129 2.5s
Convert 0.1% 210 2.7s
Dynamic Yield 0% 69 2.7s
Optimizely 0.1% 157 2.9s
Split.io 0% 9 3.2s
LaunchDarkly 0.1% 141 4.0s
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
81% of Google Optimize sites pass LCP. LaunchDarkly trails 34 points behind, leaving 53% of its sites failing. computed
The State of Web Vitals · October 2026 · 210,902 crawled 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 10%
812.3s
93126ms
870.03
731.9s
541.3s
VWO 0.2%
772.4s
74203ms
820.05
692.0s
531.2s
Convert 0.1%
692.7s
78195ms
820.06
702.0s
521.4s
Optimizely 0.1%
662.9s
63235ms
750.11
612.1s
441.2s
LaunchDarkly 0.1%
474.0s
67245ms
720.12
473.0s
521.3s
Kameleoon 0.1%
762.5s
63229ms
780.06
701.9s
541.1s
AB Tasty 0.1%
762.4s
74206ms
710.13
721.8s
56949ms
Dynamic Yield 0%
682.7s
42313ms
660.19
711.9s
641.0s
Monetate 0%
792.4s
48230ms
790.06
711.9s
421.0s
Split.io 0%
573.2s
50283ms
430.20
432.6s
571.2s
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: 81% of its sites pass. LaunchDarkly trails at 47%. computed
The State of Web Vitals · October 2026 · 210,902 crawled sites · phone field datacorewebvitals.io/state-of-cwv
Related signals Maps (4) → CDN (16) → Chat & messaging (17) → Bot detection (8) → 210,902 crawled sites with Chrome field data, representing millions of real page loads · How we measured
210,902 crawled sites with Chrome field data, representing millions of real page loads. How we measured.