With a pyro sim created, expand the pyro_import node (double click to expand):
Select the import_pyrofields node and select the ‘Save to file’ tab in its properties.
Specify the start/end frames to cache and click ‘Save to disk in background’.
Loading a cached Pyro Simulation
To load from disk, check the ‘Load from Disk’ checkbox, locate the geometry file from the ‘geo/’ directory of the project and click accept.