Creating a Game Menu and a Particles Effect: An Angry Birds-like Game, Part II - Learn GameSalad for iOS: Game Development for iPhone, iPad, and HTML5 - page 204

Spawn Rate
Figure 7-5 shows the Spawn Rate tab of the Particles behavior.
Figure 7-5 . Spawn Rate tab of the Particles behavior
In this tab, you have three setting parameters:
 Number of Particles: Here you enter the number of particles to
be spawned during the occurrence of the behavior. Be careful;
setting a high number of particles here may slow down your
game.
 Particle Startup Time: Enter the time required to spawn the
complete number of particles that you just defined above. The
unit is second.
 Particle Lifetime: Here you define the life duration of a particle
before it is destroyed. The unit is second.
Velocity/Position
The Velocity/Position tab is shown in Figure 7-6.
Figure 7-6. The Velocity/Position tab of the Particles behavior