1
At a glance the headline numbers for Email marketing impact
Performance impact by email_marketing provider.
5
Providers ranked
After min-sites filter
9,766
Sites in sample
Combined across all items
0.08
Best CLS (p75)
HubSpot
The State of Web Vitals · Q2 2026 · 189,915 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 | 79.3% | 3,075 | |
| 2 | Klaviyo | 0.09 | 79.0% | 2,914 | |
| 3 | ActiveCampaign | 0.10 | 76.8% | 438 | |
| 4 | Mailchimp | 0.10 | 75.9% | 3,276 | |
| 5 | Salesforce Marketing Cloud | 0.18 | 46.8% | 63 |
The State of Web Vitals · Q2 2026 · 189,915 sites · desktop field datacorewebvitals.io/state-of-cwv
3
Passing CLS per provider which group passes the CLS most often
ProviderSitesPassing CLSp75
HubSpot 1.6%
3,075
0.08
Klaviyo 1.5%
2,914
0.09
Braze 0%
20
0.07
ActiveCampaign 0.2%
438
0.10
Mailchimp 1.7%
3,276
0.10
Iterable 0%
8
0.26
Marketo 0%
40
0.18
Salesforce Marketing Cloud 0%
63
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 76% and 79%. computed
The State of Web Vitals · Q2 2026 · 189,915 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 1.7%
802.3s
10064ms
760.10
761.8s
511.4s
HubSpot 1.6%
862.0s
9968ms
790.08
811.6s
611.1s
Klaviyo 1.5%
901.9s
9987ms
790.09
881.3s
80669ms
ActiveCampaign 0.2%
792.3s
9972ms
770.10
721.9s
451.6s
Salesforce Marketing Cloud 0%
762.4s
98115ms
470.18
652.0s
501.6s
Marketo 0%
782.4s
10071ms
650.18
761.8s
621.1s
Braze 0%
682.7s
95124ms
790.07
632.2s
471.4s
Iterable 0%
831.8s
83112ms
670.26
83970ms
83557ms
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.
Klaviyo leads on CLS: 79% of its sites pass. Mailchimp trails at 76%. computed
The State of Web Vitals · Q2 2026 · 189,915 sites · desktop field datacorewebvitals.io/state-of-cwv
Related signals
Font services (4) →
Session recording (11) →
Search (5) →
Performance services (8) →
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.