1
At a glance the headline numbers for Personalization impact
Performance impact by personalization provider.
4
Providers ranked
After min-sites filter
15,479
Sites in sample
Combined across all items
0.03
Best CLS (p75)
Elfsight
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
2
The ranking sorted by CLS at p75, fastest first
| # | Provider | CLS p75 | Passing | Sites | |
|---|---|---|---|---|---|
| 1 | Elfsight | 0.03 | 87.2% | 2,298 | |
| 2 | Algolia Recommend | 0.03 | 87.3% | 13,065 | |
| 3 | Nosto | 0.10 | 75.0% | 51 | |
| 4 | Dynamic Yield | 0.21 | 63.6% | 65 |
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
3
Passing CLS per provider which group passes the CLS most often
ProviderSitesPassing CLSp75
Algolia Recommend 6.9%
13,065
0.03
Elfsight 1.2%
2,298
0.03
Nosto 0%
51
0.10
Dynamic Yield 0%
65
0.21
Klevu 0%
26
0.20
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
No provider stands out: pass rates sit between 87% and 87%. computed
The State of Web Vitals · Q2 2026 · 189,915 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
Algolia Recommend 6.9%
812.2s
92137ms
870.03
751.8s
611.1s
Elfsight 1.2%
802.3s
94128ms
870.03
751.8s
601.2s
Dynamic Yield 0%
662.7s
40322ms
640.21
711.9s
631.1s
Nosto 0%
712.5s
85184ms
750.10
731.9s
531.4s
Klevu 0%
722.5s
88169ms
560.20
721.8s
60920ms
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.
Algolia Recommend leads on CLS: 87% of its sites pass. Elfsight trails at 87%. computed
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
Related signals
JS libraries (23) →
Tag managers (8) →
A/B testing (10) →
Chat & messaging (17) →
Chrome field data from 189,915 sites, representing millions of real page loads · How we measured
Chrome field data from 189,915 sites, representing millions of real page loads. How we measured.