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
189,915
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 INP site count and median INP at each level of stylesheets per page — n

0ms 63ms 125ms 188ms 250ms
200ms
0 14431 28862
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 · Q2 2026 · 189,915 sites · desktop 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 11,457 98% 46ms
1–2 14,216 99% 45ms
3–4 16,418 99% 46ms
5–6 14,012 99% 48ms
7–10 23,312 99% 48ms
11–15 22,644 99% 49ms
16–24 28,862 99% 49ms
25–38 26,937 99% 50ms
39–60 19,838 99% 52ms
61–95 8,672 99% 58ms
>p98 3,547 97% 62ms
Good Needs Improvement Poor Faded rows: under 100 sites

Stylesheets per page — n 14. p75 29. p99 118. At the low end (0): INP 46ms. At the high end (>p98): INP 62ms. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · desktop 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 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 (≤200ms) Needs improvement Poor (>500ms) Site count
The State of Web Vitals · Q2 2026 · 189,915 sites · desktop 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
0 967 98% 55ms
0.1–0.247 419 100% 32ms
0.247–0.61 1,021 96% 49ms
0.61–1.5 1,864 98% 50ms
1.5–3.72 2,743 98% 49ms
3.72–9.17 5,337 98% 48ms
9.17–22.6 13,693 98% 47ms
22.6–55.9 39,617 99% 47ms
55.9–138 57,681 99% 49ms
138–341 36,766 99% 51ms
341–841 8,885 99% 50ms
>p98 3,430 99% 49ms
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 55ms. At the high end (>p98): INP 49ms. 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.

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, 87% of sites pass the LCP. Where it is high, 72% 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