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 Q1 2026 edition · Phone 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
554 KB
script weight
on the typical page
1,009 KB
1 in 4 pages exceed this
script weight
94,748
sites measured
phone field data

The typical page runs 26 scripts weighing 554 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 scripts per page — n

0ms 63ms 125ms 188ms 250ms
200ms
0 9545 19089
0 1–2 3 4 5–7 8–11 12–18 19–29 30–48 49–77 78–125 >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 scripts per page — n which level passes the INP most often

Scripts per page — nSitesPassing INPINP
0 2,071 73% 111ms
1–2 2,354 81% 110ms
3 1,495 84% 104ms
4 1,808 90% 92ms
5–7 5,325 89% 94ms
8–11 7,714 91% 93ms
12–18 13,952 94% 92ms
19–29 17,317 94% 95ms
30–48 19,089 94% 99ms
49–77 13,478 93% 104ms
78–125 8,310 91% 111ms
>p98 1,835 86% 130ms
Good Needs Improvement Poor Faded rows: under 100 sites

Scripts per page — n 26. p75 48. p99 154. At the low end (0): INP 111ms. At the high end (>p98): INP 130ms. 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 scripts per page — size

0ms 63ms 125ms 188ms 250ms
200ms
0 18705 37409
0 0.1–0.28 0.28–0.784 0.784–2.19 2.19–6.14 6.14–17.2 17.2–48.2 48.2–135 135–378 378–1057 1057–2959 >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 scripts per page — size which level passes the INP most often

Scripts per page — sizeSitesPassing INPINP
0 359 85% 114ms
0.28–0.784 86 61% 136ms
0.784–2.19 193 78% 96ms
2.19–6.14 281 75% 104ms
6.14–17.2 766 89% 90ms
17.2–48.2 1,768 87% 88ms
48.2–135 7,975 94% 84ms
135–378 22,157 95% 89ms
378–1057 37,409 94% 97ms
1057–2959 19,523 89% 118ms
>p98 1,842 76% 137ms
Good Needs Improvement Poor Faded rows: under 100 sites

Scripts per page — size 554 KB. p75 1,009 KB. p99 3.7 MB. Spearman with INP r = +0.33. At the low end (0 KB): INP 114ms. At the high end (>p98): INP 137ms. 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

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, 73% of sites pass the INP. Where it is high, 86% 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 94,910 sites, representing millions of real page loads · How we measured