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Quick start

A first slow-motion render takes six steps, all in Properties > Output > TimeShift.

The top of the TimeShift panel: Output Folder, Start and End, and the Chunks list with one chunk active
The top of the panel: Output Folder, the render range and the Chunks list.
  1. Pick an output folder. TimeShift writes its own image sequence there and leaves your scene’s own output path as it was. The default, //timeshift/, sits next to your saved .blend.
  2. Set the render range. Type a start and end, or click the clock button to copy the Timeline’s range.
  3. Add a chunk. Click + in the Chunks list, then set Start and End to the moment you want slowed, Speed to 0.25 (4x slower) and Ease In / Ease Out to a few frames. In the Timeline you can instead press U and drag across the moment.
  4. Bake simulations. If the scene has physics, click Bake All Dynamics so caches interpolate between frames.
  5. Preview. Choose a Shading mode (Material is a good default) and click Preview TimeShift to check the timing in seconds.
  6. Render. Click Render TimeShift. The line above the button shows how many frames and seconds the result will run.
The panel footer: Whole range 0 to 30, about 73 frames, 2.4 s at 30 fps, above the Render TimeShift button
The line above Render TimeShift: this setup renders about 73 frames, 2.4 s at 30 fps.

Import the finished sequence into your editor at the scene’s frame rate: slowed moments now play back slower, everything else at normal speed.