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Pick a speed, decide whether voices should keep their normal pitch, and export. The new file plays at the speed you chose — this isn't just a preview setting.
Changing speed does two different jobs. Speeding up turns a long, slow recording — a drive, a build, a queue — into something watchable in seconds. Slowing down lets you actually see a fast action, which is why coaches and repair videos lean on it.
The exported file genuinely plays at the new speed; the change is baked into the frames and the audio, not applied as a player setting. Audio is resampled along with the video, and by default voices are corrected so they don't turn into chipmunks at 2x or a growl at 0.5x. Turn that option off if you want the classic pitch-shifted effect.
Because the clip has to play through once while it is captured, a 2x export finishes in half the clip's length, while 0.25x takes four times as long. Trim the clip first if it is long.
It plays back the frames you already have, stretched over more time, so very slow settings can look steppy. Footage shot at 60fps or higher slows down far better than 24 or 30fps footage.
Yes. Video and audio are captured together, so they stay locked regardless of the speed you pick.
Uncheck “Keep the original sound” and the export comes out silent, which is common for timelapses that will get music added later.