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. Spearman with LCP r = +0.40. At the low end (0): LCP 1.5s. At the high end (>p98): 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 40 KB. p75 2.9 MB. p99 45.2 MB. At the low end (0 KB): LCP 1.6s. At the high end (>p98): LCP 1.9s. 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?
Media per page correlates with the LCP. Media count separates passing sites from failing sites more than media weight does. Where the media count is low, 83% of sites pass the LCP. Where it is high, 73% do. The decline is gradual. There is no point where sites suddenly start failing.
Chrome field data from 94,910 sites, representing millions of real page loads. How we measured.