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for this blender particle experiment I made a particle system containing 1000000 cubes

I didn't upload the blend file this time, because its very huge but easy to reporduce.

I added two cubes and a plane. The plane is a collision object One cube contains the particle system, the other one is used as a particle object.

In the emmision block set "Emit from " to Volume use Grid.

Set the resolution to 100 - et voila - 1000000 particles

I've also set the particle size to 0.01