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 · 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
107,873
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 · Q2 2026 · 189,915 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 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 · 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 1,099 88% 0.00
738–1810 657 89% 0.00
1811–4448 1,439 88% 0.00
4449–10926 3,947 89% 0.00
10927–26840 11,569 91% 0.00
26841–65934 22,158 91% 0.00
65935–161973 25,112 90% 0.00
161974–397901 21,309 89% 0.00
397902–977476 13,473 90% 0.00
977477–2401253 4,952 89% 0.00
>p98 2,158 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 · Q2 2026 · 189,915 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 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 · 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
0.002–0.005 168 79% 0.00
0.005–0.012 425 72% 0.00
0.012–0.029 1,865 88% 0.00
0.029–0.066 5,454 91% 0.00
0.066–0.153 19,220 90% 0.00
0.153–0.355 18,862 90% 0.00
0.355–0.822 12,346 86% 0.00
0.822–1.9 9,252 86% 0.00
1.9–4.4 5,000 87% 0.00
>p98 1,483 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 · Q2 2026 · 189,915 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 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 · 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
0.002–0.004 192 84% 0.00
0.004–0.007 761 82% 0.00
0.007–0.014 999 88% 0.00
0.014–0.026 2,277 89% 0.00
0.026–0.051 5,005 90% 0.00
0.051–0.098 20,230 88% 0.00
0.098–0.188 25,857 88% 0.00
0.188–0.362 15,506 90% 0.00
0.362–0.696 2,148 91% 0.00
>p98 1,492 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 · Q2 2026 · 189,915 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.

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