1
At a glance the headline numbers for Email marketing impact
Performance impact by email_marketing provider.
5
Providers ranked
After min-sites filter
9,785
Sites in sample
Combined across all items
123ms
Best INP (p75)
Mailchimp
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
2
The ranking sorted by INP at p75, fastest first
| # | Provider | INP p75 | Passing | Sites | |
|---|---|---|---|---|---|
| 1 | Mailchimp | 123ms | 96.2% | 3,286 | |
| 2 | HubSpot | 134ms | 93.6% | 3,078 | |
| 3 | ActiveCampaign | 148ms | 92.7% | 441 | |
| 4 | Klaviyo | 163ms | 88.8% | 2,917 | |
| 5 | Salesforce Marketing Cloud | 220ms | 63.9% | 63 |
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
3
Passing INP per provider which group passes the INP most often
ProviderSitesPassing INPp75
Mailchimp 1.7% 3,286 123ms
Marketo 0% 40 156ms
HubSpot 1.6% 3,078 134ms
ActiveCampaign 0.2% 441 148ms
Klaviyo 1.5% 2,917 163ms
Iterable 0% 8 185ms
Braze 0% 20 190ms
Salesforce Marketing Cloud 0% 63 220ms
Good Needs Improvement Poor Sorted best-passing first · median colored by its own rating · pass = good INP (200ms at p75) · one value per site
96% of Mailchimp sites pass INP. Klaviyo trails 7 points behind. computed
The State of Web Vitals · Q2 2026 · 189,915 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
HubSpot 1.6%
772.4s
94134ms
860.04
692.0s
521.3s
Salesforce Marketing Cloud 0%
742.5s
64220ms
790.09
632.1s
341.5s
Braze 0%
672.7s
83190ms
890.08
442.3s
331.4s
Marketo 0%
722.6s
94156ms
830.03
642.0s
501.3s
Iterable 0%
861.9s
86185ms
710.45
861.4s
86789ms
Klaviyo 1.5%
872.0s
89163ms
900.03
851.5s
80711ms
Mailchimp 1.7%
772.4s
96123ms
880.02
702.0s
491.4s
ActiveCampaign 0.2%
692.7s
93148ms
850.04
602.3s
431.7s
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.
Mailchimp leads on INP: 96% of its sites pass. Klaviyo trails at 89%. computed
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
Related signals Font services (4) → Session recording (11) → CMS (17) → Search (6) → 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.