“Caronte” is the name of RealFlow's rigid and soft body dynamics engine – it includes several elements
RealFlow's Caronte solver is able to interact with Dyverso, Hybrido, standard particles fluids, and RealWave surfaces.
In order to change Caronte's quality level, go to Simulation Options > Caronte
In many cases a "Quality" value of 25-35 is sufficient for many scenes. In the screenshot you can see the default settings:
If the project does not contain any fluid elements set the "MIN substeps" and "MAX substeps" of RealFlow's "Simulation Options" to 1 and speed up the simulation: