Can we know about your PC's specification? Or is it a laptop?
Try to reduce the game's resolution first and see if the FPS improves.
It's a Windows 8.1 laptop. Reducing the resolution did make the game faster, but when I tried to save at the beginning of the game, I was able to open the menu but it froze immediately after.
Do you have a graphics processor built-in within your laptop? You can right-click the game's .exe and choose the option below.
