OMG, I did not thought of such a good resonances.
Thanks to you all!
I'll keep on working.

BTW: In my first Level I'm using a lot of torches (24 at the moment, but this will increase). And I'm using the same fire-action for each torch.
My Problem is now, that the fire animation is shown wrong. it's no permanent burning, the torches eject fire-shots.
To many torches with the same action? to many particle actions??