The State of Web Vitals

Email marketing impact

Performance impact by email_marketing provider.

Field data PhoneDesktopAll Scope All sites Q2 2026 edition · Phone field outcomes
Metric LCP INP CLS
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
0.02
Best CLS (p75)
Mailchimp
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
2

The ranking sorted by CLS at p75, fastest first

# Provider CLS p75 Passing Sites
1 Mailchimp 0.02 88.4%
3,276
2 Klaviyo 0.03 89.8%
2,914
3 ActiveCampaign 0.04 84.9%
438
4 HubSpot 0.04 85.6%
3,075
5 Salesforce Marketing Cloud 0.09 79.0%
63
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
3

Passing CLS per provider which group passes the CLS most often

ProviderSitesPassing CLSp75
Klaviyo 1.5% 2,914 90% 0.03
Braze 0% 20 89% 0.08
Mailchimp 1.7% 3,276 88% 0.02
HubSpot 1.6% 3,075 86% 0.04
ActiveCampaign 0.2% 438 85% 0.04
Marketo 0% 40 83% 0.03
Salesforce Marketing Cloud 0% 63 79% 0.09
Iterable 0% 8 71% 0.25
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

90% of Klaviyo sites pass CLS. ActiveCampaign trails 5 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
Mailchimp 1.7%
772.4s
96123ms
880.02
702.0s
491.4s
HubSpot 1.6%
772.4s
94134ms
860.04
692.0s
521.3s
Klaviyo 1.5%
872.0s
89163ms
900.03
851.5s
80710ms
ActiveCampaign 0.2%
692.7s
93148ms
850.04
602.3s
431.7s
Salesforce Marketing Cloud 0%
742.5s
64220ms
790.09
632.1s
341.5s
Marketo 0%
722.6s
94156ms
830.03
642.0s
501.4s
Braze 0%
672.7s
83186ms
890.08
442.2s
331.3s
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.

Klaviyo leads on CLS: 90% of its sites pass. ActiveCampaign trails at 85%. 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) → Search (5) → Performance services (8) → Chrome field data from 189,915 sites, representing millions of real page loads · How we measured