I assume Tiktok loads the initial fMP4 fragment (metadata + 500ms of video) for about 10 videos at once. If you scroll extremely fast through videos, you'll a

I assume Tiktok loads the initial fMP4 fragment (metadata + 500ms of video) for about 10 videos at once. If you scroll extremely fast through videos, you'll always get a short moment where it's loading after the same number of videos.