1
At a glance the headline numbers for Personalization impact
Performance impact by personalization provider.
2
Providers ranked
After min-sites filter
8,167
Sites in sample
Combined across all items
0.03
Best CLS (p75)
Elfsight
The State of Web Vitals · Q1 2026 · 94,910 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 | 85.3% | 1,231 | |
| 2 | Algolia Recommend | 0.03 | 86.9% | 6,936 |
The State of Web Vitals · Q1 2026 · 94,910 sites · phone field datacorewebvitals.io/state-of-cwv
3
Passing CLS per provider which group passes the CLS most often
ProviderSitesPassing CLSp75
Algolia Recommend 7.3% 6,936 0.03
Elfsight 1.3% 1,231 0.03
Nosto 0% 30 0.09
Dynamic Yield 0% 37 0.17
Klevu 0% 17 0.19
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 85% and 87%. computed
The State of Web Vitals · Q1 2026 · 94,910 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 7.3%
812.3s
92137ms
870.03
751.8s
601.1s
Elfsight 1.3%
802.3s
94129ms
850.03
761.8s
591.2s
Dynamic Yield 0%
593.0s
41310ms
630.17
662.1s
531.3s
Nosto 0%
822.3s
82187ms
790.09
821.6s
611.0s
Klevu 0%
752.5s
88167ms
630.19
751.8s
56926ms
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 85%. computed
The State of Web Vitals · Q1 2026 · 94,910 sites · phone field datacorewebvitals.io/state-of-cwv
Related signals JS libraries (22) → Tag managers (8) → A/B testing (10) → Chat & messaging (16) → Chrome field data from 94,910 sites, representing millions of real page loads · How we measured
Chrome field data from 94,910 sites, representing millions of real page loads. How we measured.