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

0ms 63ms 125ms 188ms 250ms
200ms
0 7504 15007
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 · Q1 2026 · 94,910 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 1,271 78% 112ms
1–2 7,456 86% 97ms
3–4 8,639 89% 97ms
5–6 7,476 90% 98ms
7–10 12,220 91% 97ms
11–15 11,954 93% 95ms
16–24 15,007 95% 95ms
25–38 14,109 95% 96ms
39–60 10,383 95% 104ms
61–95 4,549 92% 112ms
>p98 1,846 89% 121ms
Good Needs Improvement Poor Faded rows: under 100 sites

Stylesheets per page — n 15. p75 31. p99 119. At the low end (0): INP 112ms. At the high end (>p98): INP 121ms. computed

The State of Web Vitals · Q1 2026 · 94,910 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 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 (≤200ms) Needs improvement Poor (>500ms) Site count
The State of Web Vitals · Q1 2026 · 94,910 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
0 505 86% 109ms
0.1–0.247 203 94% 71ms
0.247–0.609 508 88% 90ms
0.609–1.5 1,003 83% 104ms
1.5–3.71 1,458 75% 108ms
3.71–9.15 2,780 79% 109ms
9.15–22.6 7,041 86% 99ms
22.6–55.8 20,948 93% 94ms
55.8–138 30,306 94% 99ms
138–340 19,282 94% 102ms
340–838 4,679 94% 98ms
>p98 1,801 94% 98ms
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 109ms. At the high end (>p98): INP 98ms. 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