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 · Desktop 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
desktop field data

The typical page runs 26 scripts weighing 552 KB.

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

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

0ms 750ms 1500ms 2250ms 3000ms
2.5s
0 17736 35472
0 1–2 3 4 5–7 8–11 12–18 19–30 31–48 49–78 79–126 >p98
Good (≤2.5s) Needs improvement Poor (>4s) Site count
The State of Web Vitals · Q2 2026 · 189,915 sites · desktop field datacorewebvitals.io/state-of-cwv
3

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

Scripts per page — nSitesPassing LCPLCP
0 3,961 87% 1.2s
1–2 4,652 85% 1.2s
3 2,889 87% 1.2s
4 3,345 88% 1.1s
5–7 10,175 89% 1.1s
8–11 14,846 91% 1.1s
12–18 26,268 91% 1.2s
19–30 35,472 90% 1.3s
31–48 33,797 86% 1.5s
49–78 26,704 81% 1.6s
79–126 15,132 77% 1.7s
>p98 3,443 74% 1.8s
Good Needs Improvement Poor Faded rows: under 100 sites

Scripts per page — n 26. p75 49. p99 156. At the low end (0): LCP 1.2s. At the high end (>p98): LCP 1.8s. computed

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

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

0ms 750ms 1500ms 2250ms 3000ms
2.5s
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 (≤2.5s) Needs improvement Poor (>4s) Site count
The State of Web Vitals · Q2 2026 · 189,915 sites · desktop field datacorewebvitals.io/state-of-cwv
5

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

Scripts per page — sizeSitesPassing LCPLCP
0 763 87% 1.4s
0.28–0.784 147 90% 824ms
0.784–2.2 326 89% 969ms
2.2–6.15 571 88% 1.1s
6.15–17.2 1,505 92% 1.0s
17.2–48.2 3,496 93% 925ms
48.2–135 15,226 93% 989ms
135–378 42,449 91% 1.2s
378–1060 71,127 87% 1.4s
1060–2968 36,960 81% 1.6s
>p98 3,507 72% 1.8s
Good Needs Improvement Poor Faded rows: under 100 sites

Scripts per page — size 552 KB. p75 1,006 KB. p99 3.7 MB. At the low end (0 KB): LCP 1.4s. At the high end (>p98): LCP 1.8s. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · desktop 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?

Passing INP barely moves across the range: 98% at one end, 95% at the other. This signal does not separate passing sites from failing ones.

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