Discourse doesn’t set the preload attribute of oneboxed HTML5 videos, so it’s entirely up to the browser whether to load the video. At a guess, I’d say that desktop browsers will tend to load it, and mobile browsers will tend not to. We could add preload="metadata" so that only the video metadata is loaded until the video is clicked. That discussion should probably be in a new thread, as it’s not really part of this 
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