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 · 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
552 KB
script weight
on the typical page
1,006 KB
1 in 4 pages exceed this
script weight
180,684
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 INP site count and median INP at each level of scripts per page — n

0ms 63ms 125ms 188ms 250ms
200ms
0 17736 35472
0 1–2 3 4 5–7 8–11 12–18 19–30 31–48 49–78 79–126 >p98
Good (≤200ms) Needs improvement Poor (>500ms) Site count
The State of Web Vitals · Q2 2026 · 189,915 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 3,961 74% 113ms
1–2 4,652 81% 107ms
3 2,889 84% 104ms
4 3,345 90% 92ms
5–7 10,175 90% 93ms
8–11 14,846 91% 93ms
12–18 26,268 94% 92ms
19–30 35,472 94% 95ms
31–48 33,797 94% 100ms
49–78 26,704 94% 104ms
79–126 15,132 91% 112ms
>p98 3,443 85% 131ms
Good Needs Improvement Poor Faded rows: under 100 sites

Scripts per page — n 26. p75 49. p99 156. At the low end (0): INP 113ms. At the high end (>p98): INP 131ms. computed

The State of Web Vitals · Q2 2026 · 189,915 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 35564 71127
0 0.1–0.28 0.28–0.784 0.784–2.2 2.2–6.15 6.15–17.2 17.2–48.2 48.2–135 135–378 378–1060 1060–2968 >p98
Good (≤200ms) Needs improvement Poor (>500ms) Site count
The State of Web Vitals · Q2 2026 · 189,915 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
0 763 84% 108ms
0.28–0.784 147 68% 122ms
0.784–2.2 326 79% 96ms
2.2–6.15 571 80% 101ms
6.15–17.2 1,505 90% 91ms
17.2–48.2 3,496 87% 87ms
48.2–135 15,226 94% 85ms
135–378 42,449 96% 90ms
378–1060 71,127 94% 97ms
1060–2968 36,960 89% 117ms
>p98 3,507 75% 139ms
Good Needs Improvement Poor Faded rows: under 100 sites

Scripts per page — size 552 KB. p75 1,006 KB. p99 3.7 MB. Spearman with INP r = +0.33. At the low end (0 KB): INP 108ms. At the high end (>p98): INP 139ms. 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.

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, 74% of sites pass the INP. Where it is high, 85% 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