How to speed up simulation in Modelsim SE 10.4

Hi,

I use Modelsim SE 10.4 to simulate LDPC IP core generated by Quartus, but it runs too slowly. It uses 1 second to simulate 4 clock periods. How can I speed up the simulation?

The Resolution in modelsim.ini is nanosecond, just like the photo below.

PS:

The modelsim runs very fast in other simulation which project don't have LDPC IP inside. When simulate the LDPC IP the speed becomes very very slow. I want khow if that is normal and how to fix the problem.