---
title: speedFactor
framework: scenekit
role: symbol
role_heading: Instance Property
path: scenekit/scnparticlesystem/speedfactor
---

# speedFactor

A multiplier for the speed at which SceneKit runs the particle simulation. Animatable.

## Declaration

```swift
var speedFactor: CGFloat { get set }
```

## Discussion

Discussion Use this property to speed up or slow down the overall behavior of a particle system without changing the many individual properties (such as acceleration, particleAngularVelocity, and particleBounce) that affect the motion of particles. The default value is 1.0. Lower values slow down the effect; higher values make the effect run faster. You can animate changes to this property’s value. See Animating SceneKit Content.

## See Also

### Controlling Particle Simulation

- [isLocal](scenekit/scnparticlesystem/islocal.md)
- [reset()](scenekit/scnparticlesystem/reset().md)