---
title: speed
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/actionanimation/speed
---

# speed

A factor that changes the animation’s rate of playback.

## Declaration

```swift
var speed: Float { get set }
```

## Discussion

Discussion The default value is 1.0, which doesn’t alter the animation’s duration. A value of 2.0 indicates that the duration is half the normal rate. A value of 0.5 indicates that the duration is twice the normal rate. Negative values play the animation in reverse. This property doesn’t affect the animation’s delay.