[Home](./index.md) > [server](./server.md) > [ParticleEmitterOptions](./server.particleemitteroptions.md) > [rateVariance](./server.particleemitteroptions.ratevariance.md) ## ParticleEmitterOptions.rateVariance property The rate per second variance of the particle emission rate. **Signature:** ```typescript rateVariance?: number; ```