what are the correct DosBox settings for keen 4,5,6?

When i ran CK4 i did put the Dosbox settings at max cycles. Which can be done by pressing CTRL + F12.
Some more information can be found here: http://www.dosbox.com/wiki/Performance
I am not completely sure about the settings though i just pressed the cycle upgrade untill i got the message saying it won't get any higher. (i think that was somewhere between 16k - 20k cycles)