nonlinear time history analysis, help!

[antidude]

Hi everybody.
I have a problem with my model, it is a building with 22 stories and 3 basements, it have shear walls with columns and beams, i have assigned hinges to the frames, and shell nonlinear layered to the walls and i have loaded a motion ground or time history function, the load case is a nonlinear time history with direct integration. But it take a long time, because the substeps in the analysis process are very small when the model begin to plasticized, i want to optimize it. What can i do?
I understand that the parameters of control solution and a integration solution can change and solve this problem, but i dont have idea about this parameters.
so, can any help me with this problem?

Thank you.
PD: i have uploaded my model on sendspace.
Model: Link
Model:

http://www.sendspace.com/file/p3ykc8

Sap2000 V.15.1

 

[antidude]

and...

I'm a student of civil engineering, and this work is for my thesis. but i can't complete due to the computational requirements demanded.

Thanks you.