slow ftp transfers

Hi,
On a new server, setup following http://www.howtoforge.com/perfect-server-debian-squeeze-with-bind-and-dovecot-ispconfig-3 I experience very slow ftp transfers
Upload by webformsubmit is ok so it must be something with pure ftpd.

btw no firewall rules added yet in controlpanel.

Do you have tips where to start?

 

Did you try both active and passive transfers in your FTP client?

 

yes, no difference

 

Are there any FTP errors in your logs?

What's the output of

Code:

iptables -L

?