I am playing with a new particle type in the Fire/Smoke solver. Unlike Drag particles, the Ballistic particles are affected by gravity and also by the movement of the fluid. They don't have any particle-to-particle interaction, so they are very fast to simulate. This sim took 12 minutes for 200 frames on my 12 thread i7 CPU and has 5 million Ballistic particles and 12 million voxels. Oh, and the sim is done in Maya :)