Hi there good to hang up here again NLSC!
For those who are having problem which is stated from the title of the thread, I found out the solution for us!
My current PC specs:
Asrock Z97 Pro4 motherboard
Intel Pentium G3258 Anniversary edition
4GB ram
Sapphire Radeon HD 6870 2GB 256bit
Seasonic M12II 620W EVO PSU
160GB old/crap HDD
Windows 8.1 64bit
Before, I have Windows 7 64bit and got some issues with horrible and even unplayable at the beginning of the game maybe it is because of the drivers issue and directx.
Then I tried at windows 8.1 64bit and a windows 8.1 driver of the graphics card(of course) and the game improved! There is still stuttering/lag but not as bad as before in windows 7. Maybe the stuttering is because of my old HDD and 4GB of ram, I'm planning to upgrade it to 8gb and overclocking the G3258 when I have a descent cooler.
Hope this helps guys!