Readycloud transfer speed

Hello,

I am currently encountering performance issue using ReadyCloud to share pictures or audio files over the Internet.

My internet connection is of type VDSL2 from the ISP Free (I'm living in France) (DL: 80MB/s UP: 19Mb/s).
http://www.speedtest.net/result/3969450749.png

Using ReadyCloud the transfer speed is variable between 50kb/s and 200kb/s. mostly 70kb/s...
But when using the FTP transfer server speed is up to the top of my connection (2.3Mb/s).
So It's not my internet connexion which reduce the upload speed.

I think it's readycloud server which lock transfer rate to 200kb/s...
With this speed readycloud is simply unusable.

Is there anyone with the same problems? a solution?

My NAS is a RN104 using ReadyNas 6.2.