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There’s no getting around it – video files are big. So big, in fact, that they accounted for 81% of internet traffic in 2021. Videos loaded on any given web page will likely be the largest asset a browser will have to deal with. Unless you are doing something extremely unusual (and probably inadvisable) with Images JavaScript, that is.
This can lead some unseasoned web developers and SEOs to look at a waterfall chart from a site speed measuring tool and declare that “video is bad for site speed”. While this is not true in its broad application, there are certain best practices you need to be aware of. The right set up will ensure that video doesn’t slow your site down, and that your site doesn’t slow your video down.
Videos always look very bad for site speed on waterfall charts.