The State of Web Vitals

A/B testing impact

Performance impact by ab_testing provider.

Field data PhoneDesktopAll Scope All sites Q2 2026 edition · Desktop field outcomes
Metric LCP INP CLS
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
21,106
Sites in sample
Combined across all items
61ms
Best INP (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 INP at p75, fastest first

# Provider INP p75 Passing Sites
1 Google Optimize 61ms 99.2%
19,928
2 AB Tasty 93ms 96.6%
109
3 VWO 96ms 97.8%
433
4 Convert 108ms 98.6%
191
5 Kameleoon 118ms 95.0%
112
6 Optimizely 122ms 91.5%
137
7 LaunchDarkly 128ms 80.6%
131
8 Dynamic Yield 188ms 83.0%
65
The State of Web Vitals · Q2 2026 · 189,915 sites · desktop field datacorewebvitals.io/state-of-cwv
3

Passing INP per provider which group passes the INP most often

ProviderSitesPassing INPp75
Google Optimize 10.5% 19,928 99% 61ms
Convert 0.1% 191 99% 108ms
VWO 0.2% 433 98% 96ms
AB Tasty 0.1% 109 97% 93ms
Monetate 0% 26 96% 138ms
Kameleoon 0.1% 112 95% 118ms
Optimizely 0.1% 137 92% 122ms
Dynamic Yield 0% 65 83% 188ms
LaunchDarkly 0.1% 131 81% 128ms
Split.io 0% 9 80% 128ms
Good Needs Improvement Poor Sorted best-passing first · median colored by its own rating · pass = good INP (200ms at p75) · one value per site

99% of Google Optimize sites pass INP. LaunchDarkly trails 18 points behind. 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
Google Optimize 10.5%
852.0s
9961ms
760.10
811.6s
581.2s
VWO 0.2%
822.3s
9896ms
780.10
771.7s
541.2s
Convert 0.1%
742.5s
99108ms
700.13
702.0s
561.5s
Optimizely 0.1%
732.7s
92122ms
700.13
751.8s
591.1s
LaunchDarkly 0.1%
543.3s
81128ms
640.29
572.6s
73815ms
Kameleoon 0.1%
822.1s
95118ms
730.12
851.6s
531.1s
AB Tasty 0.1%
842.1s
9793ms
700.13
841.5s
71870ms
Dynamic Yield 0%
782.2s
83188ms
640.13
761.5s
68985ms
Monetate 0%
852.1s
96138ms
770.08
921.6s
621.1s
Split.io 0%
333.4s
80128ms
500.33
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 INP: 99% of its sites pass. LaunchDarkly trails at 81%. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · desktop field datacorewebvitals.io/state-of-cwv
Related signals Maps (4) → CDN (15) → Chat & messaging (17) → Bot detection (7) → Chrome field data from 189,915 sites, representing millions of real page loads · How we measured