1
At a glance the headline numbers for Scheduling impact
Performance impact by scheduling provider.
1
Providers ranked
After min-sites filter
1,741
Sites in sample
Combined across all items
0.04
Best CLS (p75)
Calendly
The State of Web Vitals · October 2026 · 210,902 crawled sites · all devices field datacorewebvitals.io/state-of-cwv
2
The ranking sorted by CLS at p75, fastest first
| # | Provider | CLS p75 | Passing | Sites | |
|---|---|---|---|---|---|
| 1 | Calendly | 0.04 | 87.9% | 1,741 |
The State of Web Vitals · October 2026 · 210,902 crawled sites · all devices field datacorewebvitals.io/state-of-cwv
3
Passing CLS per provider which group passes the CLS most often
ProviderSitesPassing CLSp75
Cal.com 0% 18 0.04
Calendly 0.8% 1,741 0.04
Acuity Scheduling 0% 13 0.10
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 · 210,902 crawled sites · 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
Calendly 0.8%
822.3s
97105ms
880.04
761.8s
551.2s
Cal.com 0%
592.8s
83183ms
890.04
612.6s
471.9s
Acuity Scheduling 0%
921.8s
90178ms
750.10
921.3s
92578ms
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 · 210,902 crawled sites · all devices field datacorewebvitals.io/state-of-cwv
Related signals Reviews (8) → Customer data platforms (6) → Analytics (20) → Consent platforms (16) → 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.