Try running the game with the /nosund option. If you are unfamiliar on how to do that: create a shortcut to Demigod.exe on your desktop, right click the shortcut and choose 'Properties'. In the line after 'Target', add /nosound. So the path should look something like "C:\Program Files\Stardock Games\Demigod\bin\Demigod.exe" /nosound

Note that there's a space between "C:\Program Files\Stardock Games\Demigod\bin\Demigod.exe" and /nosound.

Then try and play the game by running this exe. If your performance improves significantly, please post in this thread: http://forums.demigodthegame.com/348232

The thread is stickied here on the technical forums.

They are working on this issue and you could help out by reading post number 42 in that particular thread.

I am having a really low fps too almost unplayable I am runnign AMD Turion 2.0ghz. 3 gigs of ram, and windows vista, please anyone help.

doublepost bug

All I had to do was set sound quality to low and turn off reverb.  It now runs perfectly smoothly.

Re-install your chipset drivers, sound drivers, and video drivers. If the problem persists, re-install the game. If the problem still persists, you've got a hardware issue.