Cache

In order to improve real-time response and avoid unnecessary recalculation of particles,the particle data can be cached in memory or stored on a drive.

Particles Cache settings.

See the General Baking docs for more information.

• The simulation is only calculated for positive framesin between the Start and End frames of the Cache panel, whether you bake or not.So if you want a simulation that is longer than the default frame range, you have to change the End frame.
• The cache is cleared automatically on changes. But not on all changes,so it may be necessary to free it manually, e.g. if you change a force field.
• The system is protected against changes after baking.If for example the mesh changes the simulation is not calculated anew.
• A simulation can only be edited in Particle Mode when it has been baked to a Disk Cache.And it must also be baked to memory in order to work in Particle Mode.
• If you are not allowed to write to the required subdirectory caching will not take place,e.g. if your blend-file path is very long and your operating systemhas a limit on the path length that is supported.