ProcessAffinityMask anyone?

[Sven]

11. Q: Your game does not support multi-core processors! How dare you, sir!

A: Cliffs of Dover does support multiple cores. However, additional cores are not used constantly, but in spikes. Expanded multicore support is in the works, but at this time the game taxes the 1st core constantly, while only delegating additional tasks to the other cores when needed.
Depending on your hardware configuration, you can play with manually setting the ProcessAffinityMask parameter of your conf.ini (WARNING: this is an UNSUPPORTED FEATURE for advanced users only). The parameter can be used to manually force all processes to a single core, for example ProcessAffinityMask=3 to have the entire game process on the 3rd core. The actual effect of this setting will vary greatly based on your individual hardware and software configuration.

quote from Luthier, so if you set it to 15 it probably won't work, or it will just set all main tasks to core number 1, as that one is standard.

EDIT: Sorry Catseye, I removed my old post as I wasn't so sure myself while you were typing yours, went looking it up on the FAQ