The sleep setting itself in not the important factor in the equation. The important factor is to use the settings to get your fps to manageable levels so you don't fry your hardware.
If that's a sleep setting of 10 or 30 it's irrelevant, just that it is accomplished.
Use the sleep tool to get your fps to a level of between 40 and 60 depending on your personal tastes.
It would be helpful if Jim's explanation of the sleep setting was added to the documentation, along with the default value.
If you take time to read the
FAQ you will see that it is already explained here on the forum. Including it in software documentation might be useful or not following the 1000 monkeys and 1000 years viewpoint.