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The "Particle Mesh (Legacy)" engine is the only one that is not multi-threaded.
How do I mesh Hybrido secondary fluids (splashes, foam, etc.)?
In most cases secondary fluids are not meshed, but rendered as particles to create a realistic impression. If you want to mesh them anyway , use the particle mesh engines.
My mesh has sharp edges and looks like liquid metal. What happend there?
This look occurs when the mesh's filter settings ("Relaxation" and "Steps") are too high. It can also happen with high "Thinning" and "Erode" (OpenVDB filter) settings.