.option FAST can speed up your simulation,but it down the accuracy and it only can be use in TR simulation.
in DC or AC simulation you can add another options base on you work.
eg: DCON DVDT etc.
Try to decrease your simulation accuracy ( simulation step), or use the newset version of hspice. As I know, the version of 2004.9 will 2~3 times faster than the older versions.
Besides fast options, autostop can help you as well.
In addition, increase step for transient, AC,DC will help when too small is not necessary.
Of course employing multi-cpu and use multi-thread job can make simulation fast dramatically.