Timeline speed graph · TimeShift docs

With Timeline Overlay on, every chunk is drawn on the Timeline, and you can reshape it by dragging instead of typing numbers.

The Timeline with a blue slowed chunk and an orange sped-up chunk, each with its label and speed line — Chunk 1 at 0.1× (blue) and Chunk 2 at 2× (orange). On the speed line, the white square is the speed grip and the light-blue squares are the ease knees.

Tint band: blue where time is slowed, orange where it is sped up. The bigger the change, the stronger the tint; the active chunk is drawn brighter.
Speed line: the chunk’s speed profile, on a log scale from 0.001x at the top to 10x at the bottom. A faint line marks 1x, and 0.1x sits at mid-height.
Label: “x speed · N frames · S s” for each chunk, or a note when it lies outside the render range.

Grab	Drag to	Notes
Left or right edge	Move the chunk’s Start or End	Snaps to whole frames; works in every Dope Sheet mode
White grip on the speed line	Change the speed: up is slower	0.001x to 10x, three decimals
Light-blue knees at the plateau ends	Change Ease In / Ease Out	Grabbable even at ease 0

Release applies the change; Esc or right-click while dragging cancels it and restores the old values. The speed grip and knees work in the Timeline view; in other Dope Sheet modes only the edges are draggable. A click that misses every chunk passes through, so scrubbing still works.

Shortcuts (hover the Timeline or Dope Sheet):

U then drag across frames: creates a new chunk, copying the last chunk’s speed and eases.
Shift+U: turns the scene’s preview range into a chunk (set a preview range with P first).

The TimeShift Chunks panel in the Dope Sheet sidebar with the New Chunk (drag) button — In the Dope Sheet sidebar, New Chunk (drag) does the same as U.

Rebind them under Preferences > Keymap > Dopesheet Generic.