This post is over 3 years old, so please keep in mind that some of its content might not be relevant anymore.
lftp is a command-line file transfer software.
Basically it’s a versatile FTP client with some interesting features.
The feature/command I use the most is “pget”.
The option “n” accepts an integer which defines the number of parallel connections to be created.
Some servers limit the bandwidth allowed per single connection. Creating multiple connections for a download allows you to multiply the download speed too.
This is the syntax:
lftp -e 'pget -n 3 http://goo.gl/PVk8Q'
This is only an image so you won’t see much difference but try with a bigger file…