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Your proc's a little slow, but it's good enough to be at least decent. Try using some speed hacks and play around with the settings. Use the latest beta from the pcsx2 google code page.

 

[|-xA-|]

Are you running at native resolution? Go to configure graphic plugin and tick native. And play around with the speedhacks, some speed it up and some can make it slower depending on the game.

 

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I can't really say, because I don't have the game. Try running the game off an iso.