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 CLS site count and median CLS at each level of stylesheets per page — n

0.00 0.04 0.08 0.11 0.15
0.1
0 14431 28862
0 1–2 3–4 5–6 7–10 11–15 16–24 25–38 39–60 61–95 >p98
Good (≤0.1) Needs improvement Poor (>0.25) Site count
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
3

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

Stylesheets per page — nSitesPassing CLSCLS
0 11,457 90% 0.00
1–2 14,216 92% 0.00
3–4 16,418 91% 0.00
5–6 14,012 90% 0.00
7–10 23,312 89% 0.00
11–15 22,644 89% 0.00
16–24 28,862 88% 0.00
25–38 26,937 88% 0.00
39–60 19,838 87% 0.00
61–95 8,672 87% 0.00
>p98 3,547 85% 0.00
Good Needs Improvement Poor Faded rows: under 100 sites

Stylesheets per page — n 14. p75 29. p99 118. At the low end (0): CLS 0.00. At the high end (>p98): CLS 0.00. computed

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

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

0.00 0.04 0.08 0.11 0.15
0.1
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 (≤0.1) Needs improvement Poor (>0.25) Site count
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
5

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

Stylesheets per page — sizeSitesPassing CLSCLS
0 967 82% 0.00
0.1–0.247 419 97% 0.00
0.247–0.61 1,021 91% 0.00
0.61–1.5 1,864 92% 0.00
1.5–3.72 2,743 88% 0.00
3.72–9.17 5,337 87% 0.00
9.17–22.6 13,693 90% 0.00
22.6–55.9 39,617 91% 0.00
55.9–138 57,681 89% 0.00
138–341 36,766 87% 0.00
341–841 8,885 87% 0.00
>p98 3,430 85% 0.00
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): CLS 0.00. At the high end (>p98): CLS 0.00. 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