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# frameRate

The number of frame updates per second to generate for the animation.

```
var frameRate: Float { get set }
```

## Discussion

The value of this property must be greater than or equal to `0`. Specifying a value of `0.0` causes the animation to run as fast as possible. Setting the property to a negative value raises an exception.

The frame rate is not guaranteed due to differences among systems for the time needed to process a frame. You can change the frame rate while an animation is running and the new value is used at the next frame. The default frame rate is set to a reasonable value (which is subject to future change).

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