When should I randomize Particles2D parameters?

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:bust_in_silhouette: Asked By ichster

When should I randomize Particles2D parameters? Should I randomize them in process()?:

func _randomize(param):
    param = param + param * randomness

func _process(delta):
	_randomize(speed_scale)
	_randomize(explosiveness)

And does the change in parameter effect all the particles, just the following ones, or something else?