Time scale independent Particle system in unity3d

ParticaleAnimator.cs

using UnityEngine;
using System.Collections;

public class ParticaleAnimator : MonoBehaviour {
  
	private void Awake()
	{
		particle = GetComponent<ParticleSystem>();
	}

	// Use this for initialization
	void Start ()
	{
		lastTime = Time.realtimeSinceStartup;
	}
	
	// Update is called once per frame
	void Update () 
	{
		
		float deltaTime = Time.realtimeSinceStartup - (float)lastTime;

        	particle.Simulate(deltaTime, true, false); //last must be false!!

        	lastTime = Time.realtimeSinceStartup;
	}

	private double lastTime;
	private ParticleSystem particle;

}

Now, in Unity 2017 there is a Delta Time option which we can set to Unscaled.