A game can only go as fast as what your computer can handle.If you only get 175% maximum on lowest settings then there's not much you can do.
Specs:
Mobo:Asus Sabertooth P67 Rev 3.0 w/ Evercool 50mm fan
CPU:i7 2600k @ 4.20GHz w/ Corsair A70
RAM:G.SKILL Sniper 8GB (2x4GB) DDR3 1600MHz CL9
GPU:MSI N580GTX Lightning (Nvidia Geforce GTX 580) 1.5GB
HDD:Western Digital Caviar Black 500GB
CD/DVD Burner:Generic LG CD/DVD Burner (Black)
Power Supply:Corsair GS800
Case:Corsair 600t (Black)
OS:Windows 7 Ultimate 64-Bit
Mobo:Asus Sabertooth P67 Rev 3.0 w/ Evercool 50mm fan
CPU:i7 2600k @ 4.20GHz w/ Corsair A70
RAM:G.SKILL Sniper 8GB (2x4GB) DDR3 1600MHz CL9
GPU:MSI N580GTX Lightning (Nvidia Geforce GTX 580) 1.5GB
HDD:Western Digital Caviar Black 500GB
CD/DVD Burner:Generic LG CD/DVD Burner (Black)
Power Supply:Corsair GS800
Case:Corsair 600t (Black)
OS:Windows 7 Ultimate 64-Bit