If the speed of a particle system is changed and it moves

ParticleSystem

Set the "world" the "Simulation Space".

Set the "true" the "Looping".

The value of "playbackspeed" is changed into a large numerical value.

 particleSystem.playbackSpeed    = 5.0f;

In the above settings,

Moving the Position of transform

I moved to reverse the first few frames.

Is it specification?

Any help would be appreciated, Thanks!