At a glance the headline numbers for Media per page
Audio and video elements on the page and their weight.
The typical page embeds 0 media files.
Distribution & median LCP site count and median LCP at each level of media per page — n
Passing LCP by media per page — n which level passes the LCP most often
Media per page — n 0. p75 0. p99 6. At the low end (0–0): LCP 1.5s. At the high end (1+): LCP 1.7s. computed
Distribution & median LCP site count and median LCP at each level of media per page — size
Passing LCP by media per page — size which level passes the LCP most often
Media per page — size 39 KB. p75 2.8 MB. p99 44.4 MB. At the low end (0–499 KB): LCP 1.7s. At the high end (10500+ KB): LCP 1.7s. computed
Why this matters for the Core Web Vitals, and where to start fixing it
When audio or video is present, it outweighs everything else on the page. An autoplaying background video competes with the LCP image for bandwidth at the worst moment, and on phones it burns data the visitor never asked for.
A poster image carries the experience until the visitor opts in. It loads like an image, it can be the LCP candidate, and the video starts on interaction. Autoplay hero video is the expensive way to do what a good photo does.
How does this affect the Core Web Vitals?
Passing LCP barely moves across the range: 83% at one end, 79% at the other. This signal does not separate passing sites from failing ones.
Chrome field data from 189,915 sites, representing millions of real page loads. How we measured.