dl speed in queque

1st my connection is fine i can dl @ 120kb/s

i'm backing up my php site and i have in queque all the files...

probles is that between a file dl and the following 1.5 sec passes with a zzz buble icon before the dl icon appear on the extreme right as if the sistem is idleing, regardless of the file size .

as a matter of fact when larger files is dled the dl speed go up to full speed

there is a lot of time wasted between single file downloads even on 1.04kb files

suggestion?

Increase the number of workers/threads in the transfer queue.