---
title: speed
framework: quartzcore
role: symbol
role_heading: Instance Property
path: quartzcore/camediatiming/speed
---

# speed

Specifies how time is mapped to receiver’s time space from the parent time space.

## Declaration

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

## Discussion

Discussion For example, if speed is 2.0 local time progresses twice as fast as parent time. Defaults to 1.0.

## See Also

### Duration and Speed

- [duration](quartzcore/camediatiming/duration.md)