I have made a circuit from this paper, imported the models accordingly and added the component values as well, but the simulation is running very slowly, please help me out in fixing this issue. I have attached the LTSpice files.


https://www.sciencedirect.com/scien...RR-2&ref=pdf_download&rr=98df7c381a189cd7#b49

 

Such a complex circuit will naturally run rather slowly, since thousands of calculations are required for each node per second.
Also, specifying a maximum timestep in the transient command, as your sim shows, can also greatly increase the sim time.
Why did you specify that time?

Try simulating only a portion of the circuit at a time.

 

So Basically I should increase the maximum time step?

 

So Basically I should increase the maximum time step?

There's normally reason to specify that parameter, it's just left blank, as Spice selects the optimum value based on how fast the voltage/current is changing at each circuit node.
Why do you think you need to?