upgrading pc for jpcsp?

[Itaru]

I have a Core i7 875K running at 3.7GHz and a GeForce GTX 460 1GB. On my PC, both SRW Z2 games (Hakaihen and Saiseihen) run at full speed during all battle animations, a steady 30 fps with the voices perfectly synchronized. However in some of the menu screens, it goes down to around 10 fps. The slowdown during some menu screens doesn't bother me though since you don't need 30 fps when in the menu screens while making choices. Everywhere else the games run smoothly at 30 fps and I'm having a blast playing them (currently playing Saiseihen).