1
At a glance the headline numbers for Email marketing impact
Performance impact by email_marketing provider.
5
Providers ranked
After min-sites filter
10,914
Sites in sample
Combined across all items
123ms
Best INP (p75)
Mailchimp
The State of Web Vitals · October 2026 · 210,902 crawled 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 | 96.1% | 3,641 | |
| 2 | HubSpot | 135ms | 93.4% | 3,439 | |
| 3 | ActiveCampaign | 149ms | 92.8% | 488 | |
| 4 | Klaviyo | 164ms | 88.4% | 3,281 | |
| 5 | Salesforce Marketing Cloud | 226ms | 63.5% | 65 |
The State of Web Vitals · October 2026 · 210,902 crawled 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% 3,641 123ms
Marketo 0% 43 155ms
HubSpot 1.6% 3,439 135ms
ActiveCampaign 0.2% 488 149ms
Klaviyo 1.6% 3,281 164ms
Iterable 0% 8 179ms
Braze 0% 25 190ms
Salesforce Marketing Cloud 0% 65 226ms
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 8 points behind. 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
Mailchimp 1.7%
772.4s
96123ms
880.02
702.0s
501.5s
HubSpot 1.6%
762.5s
93135ms
860.04
692.0s
511.3s
Klaviyo 1.6%
882.0s
88164ms
900.03
851.5s
81700ms
ActiveCampaign 0.2%
712.7s
93149ms
860.04
622.2s
441.7s
Salesforce Marketing Cloud 0%
752.5s
64226ms
800.08
642.1s
331.5s
Marketo 0%
712.8s
94155ms
820.03
662.0s
501.3s
Braze 0%
672.7s
81190ms
910.08
432.3s
331.4s
Iterable 0%
861.7s
86179ms
710.25
861.3s
86703ms
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 88%. computed
The State of Web Vitals · October 2026 · 210,902 crawled sites · phone field datacorewebvitals.io/state-of-cwv
Related signals Font services (4) → Session recording (11) → CMS (17) → Search (6) → 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.