# Playback

In some cases it can be useful to play through a sequence to help visualize how the scene and the annotations change. This playback can be triggered using the *Play* button in the timeline.

<figure><img src="/files/aQD1Ku67uHGCsR78zhta" alt=""><figcaption></figcaption></figure>

A prerequisite for a smooth playback is that all assets are available and loaded. To facilitate this, the play functionality will run a [prefetch](/reference/sample-and-label-types.md) of the needed assets for each frame.

Playback speed can be modified from the settings sidebar.

<figure><img src="/files/1EvKZ0Bvtlh2SMtIb5BJ" alt=""><figcaption></figcaption></figure>


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