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 · Desktop 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
190,130
sites measured
desktop field data

The typical page loads 14 stylesheets weighing 77 KB.

The State of Web Vitals · Q2 2026 · 189,915 sites · desktop 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 21070 42139
0–4 5–9 10–14 15–19 20–24 25–29 30–34 35–39 40–44 45–49 50+
Good (≤0.1) Needs improvement Poor (>0.25) Site count
The State of Web Vitals · Q2 2026 · 189,915 sites · desktop 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
0–4 42,139 82% 0.02
5–9 32,216 79% 0.03
10–14 23,832 78% 0.03
15–19 17,745 75% 0.03
20–24 15,132 77% 0.03
25–29 11,541 76% 0.03
30–34 9,247 75% 0.03
35–39 7,605 75% 0.03
40–44 6,048 75% 0.03
45–49 4,858 78% 0.03
50+ 19,767 74% 0.04
Good Needs Improvement Poor Faded rows: under 100 sites

Stylesheets per page — n 14. p75 29. p99 118. At the low end (0–4): CLS 0.02. At the high end (50+): CLS 0.04. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · desktop 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 29157 58314
0–49 50–99 100–149 150–199 200–249 250–299 300+
Good (≤0.1) Needs improvement Poor (>0.25) Site count
The State of Web Vitals · Q2 2026 · 189,915 sites · desktop 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
0–49 58,314 80% 0.02
50–99 45,576 79% 0.03
100–149 24,492 76% 0.03
150–199 15,787 75% 0.04
200–249 8,427 73% 0.04
250–299 4,964 70% 0.05
300+ 15,068 74% 0.04
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 (0–49 KB): CLS 0.02. At the high end (300+ KB): CLS 0.04. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · desktop 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.

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