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 · 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
554 KB
script weight
on the typical page
1,009 KB
1 in 4 pages exceed this
script weight
94,748
sites measured
all-device field data

The typical page runs 26 scripts weighing 554 KB.

The State of Web Vitals · Q1 2026 · 94,910 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 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 · 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
0 2,071 80% 89ms
1–2 2,354 86% 93ms
3 1,495 87% 90ms
4 1,808 93% 83ms
5–7 5,325 93% 80ms
8–11 7,714 94% 80ms
12–18 13,952 96% 81ms
19–29 17,317 96% 84ms
30–48 19,089 97% 87ms
49–77 13,478 96% 89ms
78–125 8,310 95% 95ms
>p98 1,835 91% 113ms
Good Needs Improvement Poor Faded rows: under 100 sites

Scripts per page — n 26. p75 48. p99 154. At the low end (0): INP 89ms. At the high end (>p98): INP 113ms. computed

The State of Web Vitals · Q1 2026 · 94,910 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 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 · 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
0 359 89% 103ms
0.28–0.784 86 69% 106ms
0.784–2.19 193 83% 82ms
2.19–6.14 281 79% 90ms
6.14–17.2 766 90% 87ms
17.2–48.2 1,768 90% 78ms
48.2–135 7,975 95% 77ms
135–378 22,157 97% 80ms
378–1057 37,409 97% 86ms
1057–2959 19,523 93% 98ms
>p98 1,842 83% 115ms
Good Needs Improvement Poor Faded rows: under 100 sites

Scripts per page — size 554 KB. p75 1,009 KB. p99 3.7 MB. At the low end (0 KB): INP 103ms. At the high end (>p98): INP 115ms. computed

The State of Web Vitals · Q1 2026 · 94,910 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, 80% of sites pass the INP. Where it is high, 91% 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