The typical LCP image ships 101.4 KB over the wire

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

107,873

sites measured

desktop 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 · Q2 2026 · 189,915 sites · desktop 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 12556 25112

300–737 738–1810 1811–4448 4449–10926 10927–26840 26841–65934 65935–161973 161974–397901 397902–977476 977477–2401253 >p98

Good (≤0.1) Needs improvement Poor (>0.25) Site count

The State of Web Vitals · Q2 2026 · 189,915 sites · desktop 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 1,099 78% 0.03

738–1810 657 76% 0.03

1811–4448 1,439 78% 0.03

4449–10926 3,947 79% 0.03

10927–26840 11,569 80% 0.03

26841–65934 22,158 80% 0.03

65935–161973 25,112 78% 0.03

161974–397901 21,309 77% 0.03

397902–977476 13,473 78% 0.03

977477–2401253 4,952 75% 0.03

>p98 2,158 76% 0.03

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 0.03. At the high end (>p98): CLS 0.03. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · desktop 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 9610 19220

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 0.355–0.822 0.822–1.9 1.9–4.4 >p98

Good (≤0.1) Needs improvement Poor (>0.25) Site count

The State of Web Vitals · Q2 2026 · 189,915 sites · desktop 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 78% 0.00

0.001–0.002 34 65% 0.06

0.002–0.005 168 65% 0.05

0.005–0.012 425 79% 0.02

0.012–0.029 1,865 79% 0.02

0.029–0.066 5,454 82% 0.02

0.066–0.153 19,220 79% 0.03

0.153–0.355 18,862 77% 0.03

0.355–0.822 12,346 74% 0.04

0.822–1.9 9,252 75% 0.04

1.9–4.4 5,000 75% 0.03

>p98 1,483 76% 0.03

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 0.03. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · desktop 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 12929 25857

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 0.188–0.362 0.362–0.696 >p98

Good (≤0.1) Needs improvement Poor (>0.25) Site count

The State of Web Vitals · Q2 2026 · 189,915 sites · desktop 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 75% 0.05

0.002–0.004 192 77% 0.02

0.004–0.007 761 67% 0.03

0.007–0.014 999 80% 0.02

0.014–0.026 2,277 78% 0.03

0.026–0.051 5,005 79% 0.03

0.051–0.098 20,230 76% 0.03

0.098–0.188 25,857 77% 0.03

0.188–0.362 15,506 79% 0.03

0.362–0.696 2,148 76% 0.02

>p98 1,492 71% 0.04

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 0.04. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · desktop 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, 73% of sites pass the LCP. Where it is high, 86% do. The rise is gradual.

Go fix it Optimize the LCP image → LCP: resource load duration → Optimize images for Core Web Vitals →