From the info we're getting back from customers, it appears that some people are running with hardware acceleration for sound turned off. Turning this on may help with these issues. To do so, open Control Panel and double click "Sound and Audio Devices"
Once you are here, under the volume tab, under the speaker settings grouping, click the "Advanced..." button
Once there, click the performance tab and make sure the slider for Hardware Acceleration is set to "Full"
Once you do this, click "Apply" and then "OK" and try launching Demigod again, and see if the performance increases.