Quote:
Originally Posted by gap
Creation (Initial/Delay) - => initial splash particle generator spawns two times more particles per unit of time than delay particles.
EmissionArea →
→ SolidAngle 10/0 => initial particles are spawned within a space of 10 deg from henerator's origin; delay particles are more concentrated.
LifeTime 5/12 => initial particle generator lasts only 5 secons; delay generators lasts more than two times longer.
BitmapParticles →
→ MaxParticles 20/30 => the game can render up to 20 initial particles (when this limit is reached, the game waits for old particles to disappear before genereting new ones); maximum number of delay particles is 50% bigger in comparison.
→ Life 2/3 => initial particles last 2 seconds before desappearing. Delay particles can last 50% longer.
→ Size →
→→ Size 0.8/2 => on average, delay particles are 2.5 times bigger than initial particles.
→→ Variation 0.1/0.5 => initial particle size varies two times more than delay particle size.
→ Velocity →
→→ Velocity 3/2.5 => initial particles are a bit faster than delay particles.
→→ Variation 2/1 => initial particle's speed varies two times more than delay particle speed.
What about overlife settings? I see there are some difference between the two generators (creation rate overlife). These settings can have a big impact as well 
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I don't know where you are getting delay particles from

The second parameter is a variation in the range 0.0-1.0. Any values over 1.0 are incorrect. The variation works on the first parameter to give you a +- variation

EmissionArea is the only exception as the second parameter defines the angle.