The State of Web Vitals

Scripts per page

How many scripts the page runs and their over-the-wire weight.

Field data PhoneDesktopAll Scope All sites Q2 2026 edition · All devices field outcomes
Metric LCP INP CLS
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
all-device field data

The typical page runs 26 scripts weighing 552 KB.

The State of Web Vitals · Q2 2026 · 189,915 sites · all devices field datacorewebvitals.io/state-of-cwv
2

Distribution & median INP site count and median INP at each level of scripts per page — n

0ms 63ms 125ms 188ms 250ms
200ms
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 (≤200ms) Needs improvement Poor (>500ms) Site count
The State of Web Vitals · Q2 2026 · 189,915 sites · all devices field datacorewebvitals.io/state-of-cwv
3

Passing INP by scripts per page — n which level passes the INP most often

Scripts per page — nSitesPassing INPINP
5–9 14,865 87% 88ms
10–14 19,854 95% 80ms
15–19 17,447 96% 83ms
20–24 15,796 95% 85ms
25–29 13,865 96% 85ms
30–34 11,862 97% 86ms
35–39 10,243 95% 87ms
40–44 8,512 97% 88ms
45–49 7,105 97% 88ms
50–54 5,958 96% 89ms
55–59 5,141 96% 90ms
60–64 4,201 96% 90ms
65–69 3,530 97% 91ms
70–74 3,664 96% 88ms
75–79 3,602 96% 87ms
80+ 17,893 94% 99ms
Good Needs Improvement Poor Faded rows: under 100 sites

Scripts per page — n 26. p75 49. p99 156. At the low end (5–9): INP 88ms. At the high end (80+): INP 99ms. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · all devices field datacorewebvitals.io/state-of-cwv
4

Distribution & median INP site count and median INP at each level of scripts per page — size

0ms 63ms 125ms 188ms 250ms
200ms
0 17209 34418
0–199 200–399 400–599 600–799 800–999 1000–1199 1200–1399 1400–1599 1600–1799 1800+
Good (≤200ms) Needs improvement Poor (>500ms) Site count
The State of Web Vitals · Q2 2026 · 189,915 sites · all devices field datacorewebvitals.io/state-of-cwv
5

Passing INP by scripts per page — size which level passes the INP most often

Scripts per page — sizeSitesPassing INPINP
0–199 34,418 94% 79ms
200–399 33,297 97% 81ms
400–599 26,236 97% 85ms
600–799 21,252 97% 86ms
800–999 16,562 96% 88ms
1000–1199 12,061 95% 92ms
1200–1399 8,648 93% 95ms
1400–1599 6,041 94% 98ms
1600–1799 4,464 93% 99ms
1800+ 13,322 88% 110ms
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): INP 79ms. At the high end (1800+ KB): INP 110ms. 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

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.

How do scripts affect the Core Web Vitals?

Scripts per page correlates with the INP. Script count separates passing sites from failing sites more than script weight does. Where the script count is low, 87% of sites pass the INP. Where it is high, 94% do. The rise is gradual.

Go fix it 14 methods to defer JavaScript → Reduce unused JavaScript → JavaScript priority levels →
Related signals DOM size → Page weight & requests → Image source mix → Stylesheet loading mix → Chrome field data from 189,915 sites, representing millions of real page loads · How we measured