Jak II running very slow?

[addgreenmana]

For some reason, when I play this game the FPS is always hanging around 15-25.
Other games like FFXII and Fatal Frame III run perfectly.

I only have the recommended speedhacks on, and I tried it without them, and it was the same thing.
I tried different GS Plugins and it all resulted in the same FPS.

Intel Core i5 760 @ 2.8GHz
6GB RAM
ATI Radeon HD 5450

Can anyone help?

[meganova]

Your plugins settings? screenshots would be good.