Trying to get PCSX2 to work.. please help

[frozenspark]

Yeah, it's me again.. asking for help as usual. I have PCSX2 version 0.9.4 and all of the plug-ins ready. I also have an ISO of Castlevania Lament of Innocence, which according to the official pcsx2 website has been tested and should work properly. When I load the game, everything works fine, however, when the actual game loads and I start playing the framerate drops from 60 to 20 and the game becomes unplayable. Once I reach some bad guys to fight I'm sure the frame rate is going to plunge even lower. What do you guys think is causing it to run so slow and is there anything I can do to fix it? My PC specs are as follows: Core 2 Duo 6420 at 2.12 Ghz, 2.00 GB RAM, Nvidia Geforce 8800 GTS at 640MB.. though I think my CPU is definitely a bottleneck.

In the case of my CPU being sucky, would updating it to this make the game run at normal 60 fps?:

http://www.newegg.com/Product/Produc...82E16819115037

Or is better to switch to Quadcore altogether (I'm not sure if PCSX2 is capable of taking advantage of all 4 chips at the same time)