How to use multi - thread capability of workstation whit CATIA V5 R25 in machining workbench.

hi.

I have a workstation in my work place and im using catia v5 r25 to program the parts.

the workstation is a Dual physical Socket workstation whit 2 physical XEON´s. 24 thread lines. and a quadro K1200.

24 gigs of ram DDR3 ECC. ITS A THINKSTATION D20.

But unfortunately, when I load a video simulation it turns very slow. 

I deselect the option " optimized rendering for video" to improve the performance but its slow anyway. 

we have big part´s that slow the workstation in video simulation.

Does any body know how to improve the performace for video simulation in big parts?

Thank you.

Andrés Esaú.