The State of Web Vitals

LCP image size

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

Field data PhoneDesktopAll Scope All sites Q1 2026 edition · Desktop 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.

100.4 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
56,633
sites measured
desktop field data

The typical LCP image ships 100.4 KB over the wire. It carries 0.2 MP for 0.1 MP actually shown.

The State of Web Vitals · Q1 2026 · 94,910 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 6537 13074
300–738 739–1814 1815–4460 4461–10966 10967–26963 26964–66297 66298–163013 163014–400821 400822–985550 985551–2423300 >p98
Good (≤0.1) Needs improvement Poor (>0.25) Site count
The State of Web Vitals · Q1 2026 · 94,910 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
300–738 569 76% 0.03
739–1814 331 71% 0.04
1815–4460 725 79% 0.02
4461–10966 2,079 80% 0.03
10967–26963 6,117 79% 0.03
26964–66297 11,864 79% 0.03
66298–163013 13,074 78% 0.03
163014–400821 11,138 77% 0.03
400822–985550 7,005 77% 0.03
985551–2423300 2,598 76% 0.03
>p98 1,133 75% 0.03
Good Needs Improvement Poor Faded rows: under 100 sites

LCP image size — bytes 100.4 KB. p75 290.3 KB. p99 3.6 MB. At the low end (300–738): CLS 0.03. At the high end (>p98): CLS 0.03. computed

The State of Web Vitals · Q1 2026 · 94,910 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 5032 10063
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 0.153–0.354 0.354–0.818 0.818–1.89 1.89–4.38 >p98
Good (≤0.1) Needs improvement Poor (>0.25) Site count
The State of Web Vitals · Q1 2026 · 94,910 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 84 86% 0.00
0.002–0.005 86 65% 0.02
0.005–0.012 233 78% 0.02
0.012–0.029 904 79% 0.02
0.029–0.066 2,897 83% 0.02
0.066–0.153 10,063 79% 0.02
0.153–0.354 9,980 77% 0.03
0.354–0.818 6,482 75% 0.04
0.818–1.89 4,802 76% 0.03
1.89–4.38 2,592 75% 0.04
>p98 783 77% 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 · Q1 2026 · 94,910 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 6979 13957
0 0.001–0.002 0.002–0.004 0.004–0.007 0.007–0.014 0.014–0.026 0.026–0.05 0.05–0.097 0.097–0.186 0.186–0.357 0.357–0.687 >p98
Good (≤0.1) Needs improvement Poor (>0.25) Site count
The State of Web Vitals · Q1 2026 · 94,910 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
0.002–0.004 98 78% 0.02
0.004–0.007 420 68% 0.03
0.007–0.014 511 81% 0.02
0.014–0.026 1,193 79% 0.02
0.026–0.05 2,632 81% 0.03
0.05–0.097 10,116 76% 0.03
0.097–0.186 13,957 77% 0.03
0.186–0.357 8,182 79% 0.03
0.357–0.687 1,136 78% 0.02
>p98 782 72% 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 (0.002–0.004): CLS 0.02. At the high end (>p98): CLS 0.04. computed

The State of Web Vitals · Q1 2026 · 94,910 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, 89% 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 94,910 sites, representing millions of real page loads · How we measured