Particle automatic fade is not smooth about gzdoom HOT 4 CLOSED

Actor L50Beacon : BulletPuff
{
   var int user_i;
   var int user_n;

   VSpeed 0

   +PUFFONACTORS
   +BLOODLESSIMPACT
   -BLOODSPLATTER

   States
      {
      Spawn:
         TNT1 A 35 NODELAY
         {
            user_n = 88;
            for(user_i = 1; user_i <= 360; user_i++)
            {
               A_SpawnParticle("Green", SPF_RELATIVE | SPF_FULLBRIGHT, 210, 16, user_i, 512, 0, -28);
            }
         }
      RainDownHell: 
         TNT1 A 2
         {
            if(user_n)
            {
               A_SpawnItemEx("L50Fireball", random(0, 512), 0, ceilingz - 32, 0, 0, -32, random(1, 360));
               A_SpawnItemEx("L50Fireball", random(0, 512), 0, ceilingz - 32, 0, 0, -32, random(1, 360));
               user_n--;
            }
            return A_JumpIf(!user_n, "Null");
         }
         Loop
      Crash:
         Stop
      Melee:
         Stop
      }
}