[CentOS] Sftp slow on both our centos installs

The short version.
Copying over SFTP to our centos boxes maxes out at 2MB a sec.

The Question:
Is there some sort of speed limitation somewhere in the ssh/sftp daemon?

Does anyone have any idea why this could be happening?

The long version
We have centos 4.6 installed on 2 different machines, different
hardware, different nics. Even on 2 different subnets.

I've tried different switches, 1000 Full/Half 100 Full/Half and still
get the same speed. It maxes out at 2MB a sec.

Same switch, network, client using sftp to our xserves gets 10MB a
sec. Basically filling the pipe of the network.

The only thing that is the same on both the linux boxes is the distro.
So i thought maybe someone may have come across this before.

I haven't tried other protocols yet (FTP and HTTP) I'll check that tomorrow.

Thanks,
Jamie