# playbackSpeed

> The playback speed of the Particle System. 1 is normal playback speed.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine](/engine/6000.0/script-reference/unityengine.md)
* **Assembly:** UnityEngine.ParticleSystemModule

> **Warning:**
>
> **Deprecated.** playbackSpeed property is deprecated. Use main.simulationSpeed instead.

```csharp
public float playbackSpeed { get; set; }
```

### Remarks

A negative playback speed is not supported.