Slow DL speed on PrueFtp server only using FlashFxp

[Thundar]

I'm having issue were on one ProFTPD server I am limited to 330kb/s, but can open another session and get another 330kb/sec. When I try different client like Cuteftp I get over 1500kb/s so it's not the ftp server it's the client.
I have checked to make sure download limit was unchecked and anything else could think of. I can connect to a differnt ProFTPD server with flash and it works fine. So what would cause this one server to limit my speeds when using flashfxp?

Thanks.