FTP bandwith - Latency

[fouinix]

Hi all,
I'm a french ser of pfsense.
My pfsense works very well, thank you to the developpers ;)

Today, at my work, I sent a file to a ftp server (on internet), the transfert was at : 1.4MBytes/s. We have 20Mb/s symetric at work.
Then I do the same transfert to my own ftp server (in my home : pfsense + ADSL 13Mb/s about 1MBytes/s) and the transfert was at 480KBytes/s  ???

I try to find were is the problem.
I think, it can be :

• The latency of my connection

• A problem on pfsense ?

Do you have any idea ?

PS :
Ping from my work to the FTP server on internet : 15ms
Ping from my work to my FTP server (at home) : 30ms
On my pfsense I  use neither traffic shaping nor ftp helper.

Thk very much