For starter you should know what it is SSH:
SSH is a communication protocol, which is used in computer networks TCP / IP. SSH is the successor to the Telnet protocol, is used for terminal connections with remote computers. The distinctive feature of the SSH is to transfer all data in encrypted form and to identify users in many different ways.
You can start importing any file using an SSH connection.
Benefits? Import time is many times smaller. Hour ordinary imports are usually a few minutes of imports carried out by SSH.
Below you will find a link to information on how to connect via SSH to your server using Putty:
https://www.siteground.com/tutorials/ssh/putty.htm
When the connection must go to this module directory (/modules/pshowimporter/) and then perform a simple command:
php ./direct_import.php 'filename_to_import_without_extension'
You can find specified commands on files list.