The State of Web Vitals

LCP image size

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

Field data PhoneDesktopAll Scope All sites Q2 2026 edition · All devices 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
107,873
sites measured
all-device 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 · all devices 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 · all devices 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 85% 0.00
738–1810 657 88% 0.00
1811–4448 1,439 87% 0.00
4449–10926 3,947 88% 0.00
10927–26840 11,569 90% 0.00
26841–65934 22,158 89% 0.00
65935–161973 25,112 89% 0.00
161974–397901 21,309 88% 0.00
397902–977476 13,473 89% 0.00
977477–2401253 4,952 87% 0.00
>p98 2,158 87% 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 · Q2 2026 · 189,915 sites · all devices 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 · all devices 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 94% 0.01
0.001–0.002 34 91% 0.01
0.002–0.005 168 73% 0.03
0.005–0.012 425 75% 0.01
0.012–0.029 1,865 87% 0.00
0.029–0.066 5,454 90% 0.00
0.066–0.153 19,220 89% 0.00
0.153–0.355 18,862 89% 0.00
0.355–0.822 12,346 85% 0.00
0.822–1.9 9,252 86% 0.00
1.9–4.4 5,000 85% 0.00
>p98 1,483 84% 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 0.01. At the high end (>p98): CLS 0.00. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · all devices 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 · all devices 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 93% 0.00
0.001–0.002 24 88% 0.02
0.002–0.004 192 85% 0.00
0.004–0.007 761 78% 0.01
0.007–0.014 999 85% 0.00
0.014–0.026 2,277 87% 0.00
0.026–0.051 5,005 89% 0.00
0.051–0.098 20,230 87% 0.00
0.098–0.188 25,857 87% 0.00
0.188–0.362 15,506 89% 0.00
0.362–0.696 2,148 89% 0.00
>p98 1,492 84% 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 · Q2 2026 · 189,915 sites · all devices 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, 71% of sites pass the LCP. Where it is high, 84% do. The rise is gradual.

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 189,915 sites, representing millions of real page loads · How we measured