1
At a glance the headline numbers for Personalization impact
Performance impact by personalization provider.
4
Providers ranked
After min-sites filter
17,242
Sites in sample
Combined across all items
0.03
Best CLS (p75)
Elfsight
The State of Web Vitals · October 2026 · 210,902 crawled 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 | 87.3% | 2,553 | |
| 2 | Algolia Recommend | 0.03 | 87.3% | 14,565 | |
| 3 | Nosto | 0.11 | 74.5% | 55 | |
| 4 | Dynamic Yield | 0.19 | 66.1% | 69 |
The State of Web Vitals · October 2026 · 210,902 crawled 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% 14,565 0.03
Elfsight 1.2% 2,553 0.03
Nosto 0% 55 0.11
Dynamic Yield 0% 69 0.19
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 · October 2026 · 210,902 crawled 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%
822.2s
92137ms
870.03
761.8s
611.1s
Elfsight 1.2%
812.3s
93129ms
870.03
751.8s
601.2s
Dynamic Yield 0%
682.7s
42313ms
660.19
711.9s
641.0s
Nosto 0%
732.5s
86181ms
750.11
751.8s
561.2s
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 · October 2026 · 210,902 crawled sites · phone field datacorewebvitals.io/state-of-cwv
Related signals JS libraries (26) → Tag managers (8) → A/B testing (12) → Chat & messaging (17) → 210,902 crawled sites with Chrome field data, representing millions of real page loads · How we measured
210,902 crawled sites with Chrome field data, representing millions of real page loads. How we measured.