proftpd slow when transfering many small files

[lucasgirod]

I know there are already many posts on proftpd - but i haven't found the solution to my problem.

My problem is the following: Transfering lots of small files takes extremely long.

I'm on Ubuntu Jaunty (9.04) with the current ispcp trunk installed and ProFTPD 1.3.1. I reinstalled the entire system (including Ubuntu) but the problem stays.
My configuration is quite ispcp-default.

My "investigation" of the problem lead me to the following things:

• -default ispcp proftpd configuration loads mod_radius.c and mod_quotatab_radius.c in modules.conf => why?
• -according to proftpd -n -d5 every STOR-command is sent to the following modules of which I don't understand why:
  -mod_tls
  -mod_sql
  

running these modules takes time for every file - no?

I also set DelayEngine to off - didn't help.

Just to make sure the problems are proftpd-related i installed pureftpd and the problem was gone.. but I want to stay with the "default" ispcp configuration.

Copyinging files with SCP takes 15 Mins - copying them with proftpd more than 1 day...

Any ideas?