FirstWait
If LISa pings, i.e. if it sends the ICMP echo requests, it sends a bunch of requests at once, and the it will wait for the number of hundredth seconds you specify here. Usually values from 5 to 50 should be good, the maximum is 99 (gives 0.99 seconds, a very long time). Try to make this value as small as possible while still finding all running hosts.