Improving ProFTPD speed in Linux
If you’re currently running an FTP server with ProFTPD on your Linux machine, then you’re probably not experiencing the best transfer performance. To improve the speed of transfer from within your LAN (and even the outside world), two lines need to be added to the ProFTPD configuration file.
Assuming that you’ve got an XAMPP setup (if not, just find the proftpd.conf file on your file system), do this:
$ sudo gedit /opt/lampp/etc/proftpd.conf
and add these two lines at the bottom of the file. You may want to add a comment to remind yourself why you added these lines.
# Improve rate of transfers
IdentLookups Off
UseReverseDNSLookup Off
Restart the daemon and you should be good to go.