Why is my game running at such low FPS?

[sjb411]

Hello everyone. I downloaded JPCSP to play one game - Tekken 6. However, when I run it, the framerate is unplayably slow. In the menus, it keeps at above 50 fps, but as soon as I start playing the game, it drops down all the way to 10. My computer is pretty decent, and the specs are as follows:

i5 3570K
GTX 660Ti
Corsair 128gb SSD (JPCSP in this directory)
8GB DDR3 1600mhz RAM

Is the FPS lag caused by my poor computer hardware specs? Or is there a different problem?

I am running JPCSP out-of-the-box, that is, at default settings, if that helps.

Thanks in advance for any help.