Quote from ProfessorBroman:
Along with this there is a potential fix that applies to multicore processors that involves changing the processor affinity to "2" or something. I have no idea what that would do or even means, but some folks have reported positive results.
I guess that dictates how many cores the game can access simultaneously. If the game isn't optimized for more than 2, maybe it's better to just "limit" it to 2.