"Does it matter for SEO if i have a 100mb video on front page? If I have set my page to load content first, then hero image, and then the video. So let say the content and image takes couple of second to load (so you have full visual ready) and video keeps loading in the background, once loaded it replaces the hero image."
"I don't think you'd notice an SEO effect. Of course, you have a number of SEOs talking about core web vitals but we all know how little that matters for Google rankings. So yea, go big with your videos on your home page, if it is something that you think will help your conversions. But please don't just do it because it is cool and pretty - measure it."
A 100MB video file placed on a homepage that loads after primary content and a hero image is unlikely to produce a noticeable SEO effect. Core Web Vitals attract attention from SEO professionals but have limited influence on search rankings. Prioritizing visible content and deferring heavy media keeps the page usable while background media continues loading. Large videos can be beneficial if they improve conversions and user engagement. Performance should be measured to confirm benefits. Avoid adding heavy video solely for aesthetic reasons. Optimize delivery and monitor metrics before committing to large homepage media.
Read at Search Engine Roundtable
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