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
all-device field data
The typical page loads 14 stylesheets weighing 77 KB.
The State of Web Vitals · Q2 2026 · 189,915 sites · all devices 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 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 · all devices 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 90% 0.00
5–9 32,216 88% 0.00
10–14 23,832 88% 0.00
15–19 17,745 87% 0.00
20–24 15,132 88% 0.00
25–29 11,541 88% 0.00
30–34 9,247 87% 0.00
35–39 7,605 87% 0.00
40–44 6,048 87% 0.00
45–49 4,858 86% 0.00
50+ 19,767 85% 0.01
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 0.00. At the high end (50+): CLS 0.01. computed
The State of Web Vitals · Q2 2026 · 189,915 sites · all devices 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 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 · all devices 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 89% 0.00
50–99 45,576 89% 0.00
100–149 24,492 86% 0.01
150–199 15,787 86% 0.01
200–249 8,427 85% 0.01
250–299 4,964 82% 0.01
300+ 15,068 85% 0.01
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 0.00. At the high end (300+ KB): CLS 0.01. computed
The State of Web Vitals · Q2 2026 · 189,915 sites · all devices 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.
Chrome field data from 189,915 sites, representing millions of real page loads. How we measured.