How to speed up SimuLink simulation?

There is an analog Pulse Generator in the model. Also a "PM" modulator passband in the model. Thus, I guess the minimum step is limited by the PM modulator.
The simulation need to run very long time to converge the loop.

Is there any way to speed up the simulation?

Added after 1 hours 21 minutes:

SimuLink also run out of my memory quickly, how to solve it?

How to reduce memory usage?