Search Appliance SBE
Syntax: whole numbers from 1 up
Threads
This is the maximum number of simultaneous page fetching threads to allow against each site. Setting Threads higher than 5 is probably not very helpful, unless you have many "Single Pages" that are on various hosts.
Servers
This is the maximum number of different web servers to walk simultaneously. Setting this too high can stress your memory, cpu, and network.