Why the game cryostasis lags all the time in pc
 

my pc specs
dual core e5200@2.5 ghz
2 gb ddr2 ram
asrock g31 ms
xfx 9400 gt (1 gb)
450 watt psu
i was able to play best graphics games like farcry 2,crysis and gta 4 with no lag in low settings but i cant play cryostasis even on lowest settings would anyone tell me why
thanks in advance

It requires a powerful video card, since all the graphics effects and physics are being calculated on video card. You can try to switch PhysX calculations to CPU instead of videocard in nVidia control panel (however, it may actually decrease performance in case of slow CPU) and/or turn off PhysX-related options in the game.