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
2.2s
Best LCP (p75)
Google Optimize
The State of Web Vitals · October 2026 · 210,902 crawled 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% | 21,150 | |
| 2 | AB Tasty | 2.4s | 76.8% | 117 | |
| 3 | VWO | 2.4s | 77.9% | 475 | |
| 4 | Kameleoon | 2.4s | 77.2% | 129 | |
| 5 | Convert | 2.6s | 71.6% | 210 | |
| 6 | Dynamic Yield | 2.6s | 71.6% | 69 | |
| 7 | Optimizely | 2.7s | 70.1% | 157 | |
| 8 | LaunchDarkly | 3.8s | 50.7% | 141 |
The State of Web Vitals · October 2026 · 210,902 crawled sites · all devices field datacorewebvitals.io/state-of-cwv
3
Passing LCP per provider which group passes the LCP most often
ProviderSitesPassing LCPp75
Monetate 0% 28 2.3s
Google Optimize 10% 21,150 2.2s
VWO 0.2% 475 2.4s
Kameleoon 0.1% 129 2.4s
AB Tasty 0.1% 117 2.4s
Convert 0.1% 210 2.6s
Dynamic Yield 0% 69 2.6s
Optimizely 0.1% 157 2.7s
LaunchDarkly 0.1% 141 3.8s
Split.io 0% 9 3.3s
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 31 points behind, leaving 49% of its sites failing. computed
The State of Web Vitals · October 2026 · 210,902 crawled 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
Google Optimize 10%
822.2s
96104ms
860.05
751.8s
551.3s
VWO 0.2%
782.4s
81179ms
830.05
721.9s
561.1s
Convert 0.1%
722.6s
87181ms
810.07
751.8s
571.3s
Optimizely 0.1%
702.7s
75203ms
770.10
652.2s
471.3s
LaunchDarkly 0.1%
513.8s
77194ms
750.11
512.7s
531.2s
Kameleoon 0.1%
772.4s
73206ms
720.12
721.9s
541.1s
AB Tasty 0.1%
772.4s
84169ms
710.12
711.9s
621.0s
Dynamic Yield 0%
722.6s
49287ms
660.18
751.8s
62963ms
Monetate 0%
862.3s
73209ms
750.10
791.7s
431.0s
Split.io 0%
333.3s
63267ms
440.34
442.6s
56884ms
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 51%. computed
The State of Web Vitals · October 2026 · 210,902 crawled sites · all devices 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.