Slow pure-ftpd logging when starting via xinetd

Question

First logging is quick, second is a little bit delayed, but third is almost 30 seconds of waiting.

    service ftp
{
        disable = no
                socket_type     = stream
                wait            = no
                user            = root
                server          = /usr/sbin/pure-ftpd
                server_args     = -A -c5000 -C8 -D -fftp  -H -I15 -lpuredb:/etc/pure-ftpd/pureftpd.pdb -lunix -L2000:8 -m4 -s -p30000:50000 -U133:022 -u100 -Oclf:/var/log/kloxo/pureftpd.log -g/var/run/pure-ftpd.pid -k99 -Z -Y
                groups          = yes
                flags           = REUSE
}

When I start pure-ftpd like this manually:

/usr/sbin/pure-ftpd -A -c5000 -C8 -D -fftp -H -I15 -lpuredb:/etc/pure-ftpd/pureftpd.pdb -lunix -L2000:8 -m4 -s -p30000:50000 -U133:022 -u100 -Oclf:/var/log/kloxo/pureftpd.log -g/var/run/pure-ftpd.pid -k99 -Z -Y 1 -S 21

it's flying !

It all started after upgrading kernel in my CentOS 64-bit 5.8 from 2.6.18.308-20 to 3.0.54-1.el5.elrepo