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 Q1 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.

15
stylesheet count
on the typical page
77 KB
CSS weight
on the typical page
153 KB
1 in 4 pages exceed this
CSS weight
94,910
sites measured
phone field data

The typical page loads 15 stylesheets weighing 77 KB.

The State of Web Vitals · Q1 2026 · 94,910 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 7504 15007
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 · Q1 2026 · 94,910 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 1,271 91% 0.00
1–2 7,456 92% 0.00
3–4 8,639 91% 0.00
5–6 7,476 90% 0.00
7–10 12,220 89% 0.00
11–15 11,954 89% 0.00
16–24 15,007 88% 0.00
25–38 14,109 89% 0.00
39–60 10,383 87% 0.00
61–95 4,549 87% 0.00
>p98 1,846 85% 0.00
Good Needs Improvement Poor Faded rows: under 100 sites

Stylesheets per page — n 15. p75 31. p99 119. At the low end (0): CLS 0.00. At the high end (>p98): CLS 0.00. computed

The State of Web Vitals · Q1 2026 · 94,910 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 15153 30306
0 0.1–0.247 0.247–0.609 0.609–1.5 1.5–3.71 3.71–9.15 9.15–22.6 22.6–55.8 55.8–138 138–340 340–838 >p98
Good (≤0.1) Needs improvement Poor (>0.25) Site count
The State of Web Vitals · Q1 2026 · 94,910 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
0 505 81% 0.00
0.1–0.247 203 98% 0.00
0.247–0.609 508 90% 0.00
0.609–1.5 1,003 92% 0.00
1.5–3.71 1,458 88% 0.00
3.71–9.15 2,780 88% 0.00
9.15–22.6 7,041 90% 0.00
22.6–55.8 20,948 91% 0.00
55.8–138 30,306 89% 0.00
138–340 19,282 86% 0.00
340–838 4,679 87% 0.00
>p98 1,801 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 · Q1 2026 · 94,910 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, 82% 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 94,910 sites, representing millions of real page loads · How we measured