1
At a glance the headline numbers for A/B testing impact
Performance impact by ab_testing provider.
1
Providers ranked
After min-sites filter
219
Sites in sample
Combined across all items
0.04
Best CLS (p75)
Google Optimize
The State of Web Vitals · October 2026 · Shopify sites (8,248) · all devices field datacorewebvitals.io/state-of-cwv
2
The ranking sorted by CLS at p75, fastest first
| # | Provider | CLS p75 | Passing | Sites | |
|---|---|---|---|---|---|
| 1 | Google Optimize | 0.04 | 87.5% | 219 |
The State of Web Vitals · October 2026 · Shopify sites (8,248) · all devices field datacorewebvitals.io/state-of-cwv
3
Passing CLS per provider which group passes the CLS most often
ProviderSitesPassing CLSp75
VWO 0.3% 23 0.05
Convert 0.4% 36 0.05
Google Optimize 2.7% 219 0.04
Kameleoon 0.1% 6 0.06
Good Needs Improvement Poor Sorted best-passing first · median colored by its own rating · pass = good CLS (0.1 at p75) · one value per site
The State of Web Vitals · October 2026 · Shopify sites (8,248) · 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 2.7%
892.0s
93131ms
880.04
871.3s
89542ms
Convert 0.4%
802.4s
77197ms
890.05
891.7s
86573ms
VWO 0.3%
912.0s
86185ms
910.05
871.4s
96512ms
Kameleoon 0.1%
1002.0s
83179ms
830.06
1001.4s
83590ms
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 · Shopify sites (8,248) · all devices field datacorewebvitals.io/state-of-cwv
Related signals Maps (4) → CDN (16) → Chat & messaging (17) → Bot detection (8) → 203,892 crawled sites with Chrome field data, representing millions of real page loads · How we measured
203,892 crawled sites with Chrome field data, representing millions of real page loads. How we measured.