Baking particles inside Matinee

Seed modules? What do they do?
I think that particles are instanciate with random values, except that they incide into the camera in different ways and sometimes happen that a particle system don’t spawn particles because the camera don’t see it in that moment…
And then having a baked particle could be more efficient than having a real time simulation done everytime I push play button.
Is this correct or there is something I miss?