The n# of connection depends on many things. For some 
pages, the engine may be slow down because it has to 
test some unknown links (.asp or .cgi, for example)
The background system always tries to put in download 
the number of connection wanted, but in some cases 
this isn't possible.

Note: The number of sockets is not the number of 
threads - in fact HTTrack uses ONE thread for the 
engine, all sockets are polled dynamically. This 
speeds us the process and limit the amount of 
memory/cpu used!