A/B testing impact WordPress sites
Performance impact by ab_testing provider.
1
At a glance the headline numbers for A/B testing impact
Performance impact by ab_testing provider.
2
Providers ranked
After min-sites filter
7,623
Sites in sample
Combined across all items
61ms
Best INP (p75)
Google Optimize
The State of Web Vitals · October 2026 · WordPress sites (63,295) · 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 | 99.4% | 7,531 | |
| 2 | VWO | 71ms | 98.4% | 92 |
The State of Web Vitals · October 2026 · WordPress sites (63,295) · desktop field datacorewebvitals.io/state-of-cwv
3
Passing INP per provider which group passes the INP most often
ProviderSitesPassing INPp75
Convert 0% 25 77ms
Optimizely 0% 9 84ms
Kameleoon 0% 6 106ms
Google Optimize 11.9% 7,531 61ms
VWO 0.1% 92 71ms
LaunchDarkly 0% 18 127ms
Good Needs Improvement Poor Sorted best-passing first · median colored by its own rating · pass = good INP (200ms at p75) · one value per site
The State of Web Vitals · October 2026 · WordPress sites (63,295) · 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 11.9%
752.5s
9961ms
760.10
672.0s
361.7s
VWO 0.1%
782.4s
9871ms
880.06
692.0s
231.6s
Convert 0%
732.5s
10077ms
860.05
732.1s
461.8s
LaunchDarkly 0%
603.5s
80127ms
700.16
503.1s
442.0s
Optimizely 0%
752.6s
10084ms
250.17
632.2s
501.7s
Kameleoon 0%
832.2s
100106ms
670.13
671.9s
01.7s
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.
The State of Web Vitals · October 2026 · WordPress sites (63,295) · desktop field datacorewebvitals.io/state-of-cwv
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