The State of Web Vitals

Stylesheets per page

How many stylesheets the page loads and their over-the-wire weight.

Field data PhoneDesktopAll Scope All sites Q2 2026 edition · Phone field outcomes
Metric LCP INP CLS
1

At a glance the headline numbers for Stylesheets per page

How many stylesheets the page loads and their over-the-wire weight.

14
stylesheet count
on the typical page
77 KB
CSS weight
on the typical page
153 KB
1 in 4 pages exceed this
CSS weight
189,915
sites measured
phone field data

The typical page loads 14 stylesheets weighing 77 KB.

The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
2

Distribution & median INP site count and median INP at each level of stylesheets per page — n

0ms 63ms 125ms 188ms 250ms
200ms
0 14431 28862
0 1–2 3–4 5–6 7–10 11–15 16–24 25–38 39–60 61–95 >p98
Good (≤200ms) Needs improvement Poor (>500ms) Site count
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
3

Passing INP by stylesheets per page — n which level passes the INP most often

Stylesheets per page — nSitesPassing INPINP
0 11,457 81% 107ms
1–2 14,216 87% 97ms
3–4 16,418 90% 97ms
5–6 14,012 90% 98ms
7–10 23,312 90% 97ms
11–15 22,644 93% 96ms
16–24 28,862 95% 95ms
25–38 26,937 95% 97ms
39–60 19,838 95% 104ms
61–95 8,672 92% 112ms
>p98 3,547 88% 120ms
Good Needs Improvement Poor Faded rows: under 100 sites

Stylesheets per page — n 14. p75 29. p99 118. At the low end (0): INP 107ms. At the high end (>p98): INP 120ms. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
4

Distribution & median INP site count and median INP at each level of stylesheets per page — size

0ms 63ms 125ms 188ms 250ms
200ms
0 28841 57681
0 0.1–0.247 0.247–0.61 0.61–1.5 1.5–3.72 3.72–9.17 9.17–22.6 22.6–55.9 55.9–138 138–341 341–841 >p98
Good (≤200ms) Needs improvement Poor (>500ms) Site count
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
5

Passing INP by stylesheets per page — size which level passes the INP most often

Stylesheets per page — sizeSitesPassing INPINP
0 967 88% 105ms
0.1–0.247 419 97% 71ms
0.247–0.61 1,021 88% 90ms
0.61–1.5 1,864 84% 104ms
1.5–3.72 2,743 76% 108ms
3.72–9.17 5,337 78% 112ms
9.17–22.6 13,693 87% 99ms
22.6–55.9 39,617 92% 94ms
55.9–138 57,681 94% 99ms
138–341 36,766 94% 102ms
341–841 8,885 94% 99ms
>p98 3,430 94% 97ms
Good Needs Improvement Poor Faded rows: under 100 sites

Stylesheets per page — size 77 KB. p75 153 KB. p99 1.2 MB. At the low end (0 KB): INP 105ms. At the high end (>p98): INP 97ms. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
6

Why this matters for the Core Web Vitals, and where to start fixing it

Every blocking stylesheet is a render gate. The browser paints nothing until the last one arrives, so the count multiplies the risk: more requests on the critical path, more chances that one of them is the slow one.

Few files beat many here. The request side costs more than the byte side: one round trip on a cold connection outweighs a lot of kilobytes on a warm one. Bundle the critical CSS into as few files as the architecture allows.

How does CSS affect the Core Web Vitals?

Stylesheets per page correlates with the LCP. CSS weight separates passing sites from failing sites more than stylesheet count does. Where the CSS weight is low, 85% of sites pass the LCP. Where it is high, 54% do. The decline is gradual. There is no point where sites suddenly start failing.

Go fix it Eliminate render-blocking resources → Remove unused CSS →
Related signals Script loading mix → Font source → Image format mix → Iframe loading → Chrome field data from 189,915 sites, representing millions of real page loads · How we measured