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 · 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
111,713
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 · October 2026 · 196,579 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 13025 26049
300–737 738–1812 1813–4454 4455–10946 10947–26903 26904–66119 66120–162504 162505–399391 399392–981596 981597–2412500 >p98
Good (≤0.1) Needs improvement Poor (>0.25) Site count
The State of Web Vitals · October 2026 · 196,579 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 1,143 85% 0.01
738–1812 682 88% 0.00
1813–4454 1,478 87% 0.00
4455–10946 4,079 88% 0.00
10947–26903 11,994 90% 0.00
26904–66119 23,027 90% 0.00
66120–162504 26,049 89% 0.00
162505–399391 22,044 88% 0.00
399392–981596 13,916 89% 0.00
981597–2412500 5,066 87% 0.00
>p98 2,235 87% 0.00
Good Needs Improvement Poor Faded rows: under 100 sites

LCP image size — bytes 101.4 KB. p75 290.1 KB. p99 3.4 MB. At the low end (300–737): CLS 0.01. At the high end (>p98): CLS 0.00. computed

The State of Web Vitals · October 2026 · 196,579 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 9989 19977
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 0.354–0.819 0.819–1.89 1.89–4.38 >p98
Good (≤0.1) Needs improvement Poor (>0.25) Site count
The State of Web Vitals · October 2026 · 196,579 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
0 153 94% 0.01
0.001–0.002 34 91% 0.01
0.002–0.005 174 73% 0.03
0.005–0.012 438 74% 0.01
0.012–0.029 1,912 87% 0.00
0.029–0.066 5,652 90% 0.00
0.066–0.153 19,977 89% 0.00
0.153–0.354 19,505 89% 0.00
0.354–0.819 12,803 85% 0.00
0.819–1.89 9,585 86% 0.00
1.89–4.38 5,206 86% 0.00
>p98 1,539 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 7.7 MP. At the low end (0): CLS 0.01. At the high end (>p98): CLS 0.00. computed

The State of Web Vitals · October 2026 · 196,579 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 13427 26854
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 0.051–0.097 0.097–0.187 0.187–0.36 0.36–0.693 >p98
Good (≤0.1) Needs improvement Poor (>0.25) Site count
The State of Web Vitals · October 2026 · 196,579 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
0.002–0.004 202 85% 0.01
0.004–0.007 792 78% 0.01
0.007–0.014 1,044 85% 0.00
0.014–0.026 2,350 87% 0.00
0.026–0.051 5,187 89% 0.00
0.051–0.097 20,904 87% 0.00
0.097–0.187 26,854 87% 0.00
0.187–0.36 16,087 89% 0.00
0.36–0.693 2,228 89% 0.00
>p98 1,545 85% 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 · 196,579 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. 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 196,579 sites, representing millions of real page loads · How we measured