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This probably isn't the issue here, but just in case...
When I compiled my 2.6.10 kernel, I marked 2 experimental options about my ethernet card driver (tulip). Later I forgot about that and until I remembered it, I was wondering why it was taking so long (~30 secs) to get a login prompt in ssh, ftp etc.. My http download speeds were not affected but ssh, sftp were extremely "laggy".
6. "Fatal: unable to determine IP address of "hostname:
The hosting machine has a poorly configured hostname setup to the point where the resolver library cannot determine the IP from the name. Solutions include, fixing the DNS for the domain, fixing the hostname, fixing the /etc/hosts file. Which one works for you will largely depend on your OS and exactly what is wrong.
so , I think the problem that ftp logon slow concerned IP and HOSTNAME reverse lookup
This is probably caused by a firewall or DNS timeout. By default ProFTPD will try to do both DNS and ident lookups against the incoming connection. If these are blocked or excessively delayed a slower than normal login will result. To turn off DNS and ident use: