What will cause when collision check sampling rate set too low?

edit

That number only affects the wizard -- once generated, it is never used again -- thus, the easy answer is "don't change it" since it won't improve performance in anything except the wizard (which is hopefully a one time thing)

For a better understanding of what is going on, that sampling basically helps decide which links should not be collision checked later on (and this information is put in the exported SRDF). For instance, two links that are adjacent and always touch cannot be checked for collision or all plans would fail to be collision free. The wizard may also be able to determine when two links are never in contact, because they are always too far apart, and thus there is no reason to collision check those joints as the result will always be false.