1
At a glance the headline numbers for Email marketing impact
Performance impact by email_marketing provider.
4
Providers ranked
After min-sites filter
5,151
Sites in sample
Combined across all items
0.08
Best CLS (p75)
HubSpot
The State of Web Vitals · Q1 2026 · 94,910 sites · desktop field datacorewebvitals.io/state-of-cwv
2
The ranking sorted by CLS at p75, fastest first
| # | Provider | CLS p75 | Passing | Sites | |
|---|---|---|---|---|---|
| 1 | HubSpot | 0.08 | 80.9% | 1,645 | |
| 2 | Klaviyo | 0.09 | 78.4% | 1,520 | |
| 3 | ActiveCampaign | 0.10 | 77.0% | 238 | |
| 4 | Mailchimp | 0.10 | 76.9% | 1,748 |
The State of Web Vitals · Q1 2026 · 94,910 sites · desktop field datacorewebvitals.io/state-of-cwv
3
Passing CLS per provider which group passes the CLS most often
ProviderSitesPassing CLSp75
Braze 0% 12 0.03
HubSpot 1.7% 1,645 0.08
Klaviyo 1.6% 1,520 0.09
ActiveCampaign 0.3% 238 0.10
Mailchimp 1.8% 1,748 0.10
Marketo 0% 22 0.22
Salesforce Marketing Cloud 0% 30 0.18
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 77% and 81%. computed
The State of Web Vitals · Q1 2026 · 94,910 sites · desktop 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
Mailchimp 1.8%
802.3s
10064ms
770.10
761.8s
521.4s
HubSpot 1.7%
872.0s
9968ms
810.08
831.6s
611.1s
Klaviyo 1.6%
901.9s
9987ms
780.09
871.3s
80669ms
ActiveCampaign 0.3%
842.2s
10073ms
770.10
771.7s
501.3s
Salesforce Marketing Cloud 0%
832.3s
9795ms
480.18
662.1s
591.6s
Marketo 0%
712.7s
10071ms
620.22
711.8s
671.1s
Braze 0%
583.0s
92123ms
920.03
582.3s
421.5s
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.
HubSpot leads on CLS: 81% of its sites pass. ActiveCampaign trails at 77%. computed
The State of Web Vitals · Q1 2026 · 94,910 sites · desktop field datacorewebvitals.io/state-of-cwv
Related signals Font services (4) → Session recording (11) → Search (4) → Performance services (8) → 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.