The State of Web Vitals

Email marketing impact

Performance impact by email_marketing provider.

Field data PhoneDesktopAll Scope All sites Q2 2026 edition · All devices 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
0.04
Best CLS (p75)
Klaviyo
The State of Web Vitals · Q2 2026 · 189,915 sites · all devices field datacorewebvitals.io/state-of-cwv
2

The ranking sorted by CLS at p75, fastest first

# Provider CLS p75 Passing Sites
1 Klaviyo 0.04 89.1%
2,914
2 Mailchimp 0.04 86.9%
3,276
3 ActiveCampaign 0.06 84.8%
438
4 HubSpot 0.06 83.7%
3,075
5 Salesforce Marketing Cloud 0.10 77.8%
63
The State of Web Vitals · Q2 2026 · 189,915 sites · all devices field datacorewebvitals.io/state-of-cwv
3

Passing CLS per provider which group passes the CLS most often

ProviderSitesPassing CLSp75
Braze 0% 20 90% 0.07
Klaviyo 1.5% 2,914 89% 0.04
Mailchimp 1.7% 3,276 87% 0.04
ActiveCampaign 0.2% 438 85% 0.06
HubSpot 1.6% 3,075 84% 0.06
Salesforce Marketing Cloud 0% 63 78% 0.10
Marketo 0% 40 68% 0.11
Iterable 0% 8 63% 0.34
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

89% of Klaviyo sites pass CLS. HubSpot trails 5 points behind. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · all devices 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
98104ms
870.04
702.0s
491.5s
HubSpot 1.6%
792.3s
97110ms
840.06
731.9s
541.3s
Klaviyo 1.5%
882.0s
93145ms
890.04
861.4s
81691ms
ActiveCampaign 0.2%
702.7s
96119ms
850.06
632.2s
401.7s
Salesforce Marketing Cloud 0%
752.5s
74202ms
780.10
642.1s
371.5s
Marketo 0%
802.4s
97114ms
680.11
751.8s
551.2s
Braze 0%
652.7s
85184ms
900.07
452.2s
301.5s
Iterable 0%
881.6s
88157ms
630.34
881.3s
88683ms
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: 89% of its sites pass. HubSpot trails at 84%. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · all devices 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