1
At a glance the headline numbers for Scripts per page
How many scripts the page runs and their over-the-wire weight.
26
script count
on the typical page
552 KB
script weight
on the typical page
1,007 KB
1 in 4 pages exceed this
script weight
180,899
sites measured
phone field data
The typical page runs 26 scripts weighing 552 KB.
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
2
Distribution & median CLS site count and median CLS at each level of scripts per page — n
0.00 0.04 0.08 0.11 0.15
0 9927 19854
5–9 10–14 15–19 20–24 25–29 30–34 35–39 40–44 45–49 50–54 55–59 60–64 65–69 70–74 75–79 80+
Good (≤0.1) Needs improvement Poor (>0.25) Site count
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
3
Passing CLS by scripts per page — n which level passes the CLS most often
Scripts per page — nSitesPassing CLSCLS
5–9 14,865 88% 0.00
10–14 19,854 91% 0.00
15–19 17,447 91% 0.00
20–24 15,796 89% 0.00
25–29 13,865 90% 0.00
30–34 11,862 89% 0.00
35–39 10,243 87% 0.00
40–44 8,512 87% 0.00
45–49 7,105 87% 0.00
50–54 5,958 87% 0.00
55–59 5,141 89% 0.00
60–64 4,201 87% 0.00
65–69 3,530 87% 0.00
70–74 3,664 90% 0.00
75–79 3,602 90% 0.00
80+ 17,893 85% 0.00
Good Needs Improvement Poor Faded rows: under 100 sites
Scripts per page — n 26. p75 49. p99 156. At the low end (5–9): CLS 0.00. At the high end (80+): CLS 0.00. computed
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
4
Distribution & median CLS site count and median CLS at each level of scripts per page — size
0.00 0.04 0.08 0.11 0.15
0 17209 34418
0–199 200–399 400–599 600–799 800–999 1000–1199 1200–1399 1400–1599 1600–1799 1800+
Good (≤0.1) Needs improvement Poor (>0.25) Site count
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
5
Passing CLS by scripts per page — size which level passes the CLS most often
Scripts per page — sizeSitesPassing CLSCLS
0–199 34,418 94% 0.00
200–399 33,297 92% 0.00
400–599 26,236 90% 0.00
600–799 21,252 89% 0.00
800–999 16,562 87% 0.00
1000–1199 12,061 86% 0.00
1200–1399 8,648 84% 0.00
1400–1599 6,041 82% 0.00
1600–1799 4,464 84% 0.00
1800+ 13,322 77% 0.01
Good Needs Improvement Poor Faded rows: under 100 sites
Scripts per page — size 552 KB. p75 1,007 KB. p99 3.7 MB. At the low end (0–199 KB): CLS 0.00. At the high end (1800+ KB): CLS 0.01. computed
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
6
Why this matters for the Core Web Vitals, and where to start fixing it
Script weight is the most expensive weight. A kilobyte of JavaScript costs more than a kilobyte of image, because after the download it is parsed, compiled and executed on the main thread. That is the same thread that must answer every click and keystroke, which is why script totals track INP.
The count matters next to the bytes: every script is a potential long task and another spot for the main thread to stall. Most pages would lose nothing by deferring most of their scripts. The ones that truly must run early are rare.
Chrome field data from 189,915 sites, representing millions of real page loads. How we measured.