You can save each frame of your nParticle simulation in an nCache. When you playback the simulation Nucleus reads the cache files each frame, instead of recomputing the simulation.
You can specify whether you want your nCache to include position, velocity, or a number of other attribute values.
To create a new nParticle cache
For information on creating and editing nParticle nCaches, see Create or import nCaches and Work with nCache clips.