FPS boost for Mafia II PC

hey guys i have run into a problom with mafia 2 for pc
a am in a dire need for a frames per second boost
my video card is amd m88og with ati mobility radeon hd 4250
my cpu is amd turion ii p540 dual-core processor
my ram is 3834my operating system is microsoft windows 7 home premium

i realy need help and i have no money to buy things so it needs to be
a manual fix like telling me things to tweak
please help
 
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