When I press 0 to cache the frames bevor preview.
Normaly to cache and stops only when i press 0 again.
Now it chache a second and plays that cached frames.
It is also possible to make it with Trapcode Particular … create your particle with your favorite settings and set a expression for “Physics Time Factor”
I dont know if a stroke is the best Way but what i want to do ist like a gap between my Picture ( a Logo ) and the Background but complet around like a stroke