Tucked away in the process options is a little option which allows you to control the number of processors which Galileo will utilize when processing. This number is not physical cores, and includes virtual cores as well.
You can actually see what your system reports to Galileo as the maximum value in our hidden debug section. By clicking the GALILEO text at the top of the menu, you will be shown a hidden screen of information. As you can see in the screenshot below, Galileo is reporting 8 possible processor cores. A valid setting for this option is anywhere between 1 and 8.