The State of Web Vitals

LCP image size

The LCP element: transfer size and natural / rendered pixel size.

Field data PhoneDesktopAll Scope All sites October 2026 edition · Phone field outcomes
Metric LCP INP CLS
1

At a glance the headline numbers for LCP image size

The LCP element: transfer size and natural / rendered pixel size.

101.4 KB
transfer size
on the typical page
0.2 MP
file pixels
on the typical page
0.1 MP
displayed pixels
on the typical page
108,321
sites measured
phone field data

The typical LCP image ships 101.4 KB over the wire. It carries 0.2 MP for 0.1 MP actually shown.

The State of Web Vitals · October 2026 · 190,720 sites · phone field datacorewebvitals.io/state-of-cwv
2

Distribution & median CLS site count and median CLS at each level of LCP image size — bytes

0.00 0.04 0.08 0.11 0.15
0.1
0 12602 25203
300–737 738–1811 1812–4448 4449–10928 10929–26848 26849–65957 65958–162039 162040–398086 398087–977988 977989–2402649 >p98
Good (≤0.1) Needs improvement Poor (>0.25) Site count
The State of Web Vitals · October 2026 · 190,720 sites · phone field datacorewebvitals.io/state-of-cwv
3

Passing CLS by LCP image size — bytes which level passes the CLS most often

LCP image size — bytesSitesPassing CLSCLS
300–737 1,110 88% 0.00
738–1811 660 88% 0.00
1812–4448 1,447 88% 0.00
4449–10928 3,964 89% 0.00
10929–26848 11,623 91% 0.00
26849–65957 22,248 91% 0.00
65958–162039 25,203 90% 0.00
162040–398086 21,408 89% 0.00
398087–977988 13,523 90% 0.00
977989–2402649 4,968 89% 0.00
>p98 2,167 89% 0.00
Good Needs Improvement Poor Faded rows: under 100 sites

LCP image size — bytes 101.4 KB. p75 290.5 KB. p99 3.4 MB. At the low end (300–737): CLS 0.00. At the high end (>p98): CLS 0.00. computed

The State of Web Vitals · October 2026 · 190,720 sites · phone field datacorewebvitals.io/state-of-cwv
4

Distribution & median CLS site count and median CLS at each level of LCP image size — natural mp

0.00 0.04 0.08 0.11 0.15
0.1
0 9660 19320
0 0.001–0.002 0.002–0.005 0.005–0.012 0.012–0.029 0.029–0.066 0.066–0.153 0.153–0.355 0.355–0.821 0.821–1.9 1.9–4.4 >p98
Good (≤0.1) Needs improvement Poor (>0.25) Site count
The State of Web Vitals · October 2026 · 190,720 sites · phone field datacorewebvitals.io/state-of-cwv
5

Passing CLS by LCP image size — natural mp which level passes the CLS most often

LCP image size — natural mpSitesPassing CLSCLS
0 150 93% 0.00
0.001–0.002 34 91% 0.00
0.002–0.005 169 79% 0.00
0.005–0.012 426 72% 0.00
0.012–0.029 1,873 88% 0.00
0.029–0.066 5,475 91% 0.00
0.066–0.153 19,320 90% 0.00
0.153–0.355 18,939 90% 0.00
0.355–0.821 12,375 86% 0.00
0.821–1.9 9,280 86% 0.00
1.9–4.4 5,025 87% 0.00
>p98 1,489 86% 0.00
Good Needs Improvement Poor Faded rows: under 100 sites

LCP image size — natural mp 0.2 MP. p75 0.7 MP. p99 7.8 MP. At the low end (0): CLS 0.00. At the high end (>p98): CLS 0.00. computed

The State of Web Vitals · October 2026 · 190,720 sites · phone field datacorewebvitals.io/state-of-cwv
6

Distribution & median CLS site count and median CLS at each level of LCP image size — rendered mp

0.00 0.04 0.08 0.11 0.15
0.1
0 12982 25963
0 0.001–0.002 0.002–0.004 0.004–0.007 0.007–0.014 0.014–0.026 0.026–0.051 0.051–0.098 0.098–0.188 0.188–0.361 0.361–0.695 >p98
Good (≤0.1) Needs improvement Poor (>0.25) Site count
The State of Web Vitals · October 2026 · 190,720 sites · phone field datacorewebvitals.io/state-of-cwv
7

Passing CLS by LCP image size — rendered mp which level passes the CLS most often

LCP image size — rendered mpSitesPassing CLSCLS
0 14 92% 0.00
0.001–0.002 24 86% 0.00
0.002–0.004 194 84% 0.00
0.004–0.007 766 82% 0.00
0.007–0.014 1,004 88% 0.00
0.014–0.026 2,283 89% 0.00
0.026–0.051 5,025 90% 0.00
0.051–0.098 20,302 88% 0.00
0.098–0.188 25,963 88% 0.00
0.188–0.361 15,582 90% 0.00
0.361–0.695 2,150 91% 0.00
>p98 1,496 86% 0.00
Good Needs Improvement Poor Faded rows: under 100 sites

LCP image size — rendered mp 0.1 MP. p75 0.2 MP. p99 1.0 MP. At the low end (0): CLS 0.00. At the high end (>p98): CLS 0.00. computed

The State of Web Vitals · October 2026 · 190,720 sites · phone field datacorewebvitals.io/state-of-cwv
8

Why this matters for the Core Web Vitals, and where to start fixing it

Three numbers describe the LCP image: the bytes over the wire, the pixels in the file, and the pixels actually shown. The gap between the last two is pure waste. An image with far more natural pixels than rendered pixels shipped resolution nobody saw, and the extra bytes stretched the load time.

Right-size first, then compress, then pick the format. Resizing the image to what is displayed saves more than recompressing a wrong-sized original ever will.

How does the weight of the LCP image affect the LCP?

LCP image size correlates with the LCP. Displayed pixels separates passing sites from failing sites the most. Where the displayed pixels is low, 70% of sites pass the LCP. Where it is high, 83% do. The rise is gradual. The mechanism says more displayed pixels should cost LCP, but the fleet shows the opposite: bigger, better-built sites carry more of it and still pass. The cost is real per site; across sites it is drowned out by who builds them.

Go fix it Optimize the LCP image → LCP: resource load duration → Optimize images for Core Web Vitals →
Related signals LCP loading attribute → LCP element type → LCP responsive markup → LCP discovery → Chrome field data from 190,720 sites, representing millions of real page loads · How we measured