The server is an ubuntu server 11.04 with sshd.

SSH works fine for console programs.

But data transfer is slow, which is very annoying when transferring large files.

I tried two different client programs and changed the port, but the speed is always the same. I know the server can transfer data a lot faster over SSL, which afaik uses AES. I configured my SSH client to use AES, too, but no effect.

Why is using SSH multiple times slower than SSL and is there a way to improve transfer speed of SSH?