It's a common CMS, e107 site. I don't use any caching on it. It does support memcache, but enabling that, makes the site VERY slow.
I uncommented this in the firewall:
Code:
########################################
# SYN-flooding protection
########################################
#echo -e " - Enabling SYN-flood protection"
# begraenser antallet af nye indgaaende connections til maksimum 20 pr. sekund.
#iptables -N SYNCHECK
#iptables -A INPUT -i $PUBLIC_ETH -p tcp --syn -j SYNCHECK
#iptables -A SYNCHECK -m limit --limit 1/s --limit-burst 20 -j RETURN
#iptables -A SYNCHECK -m limit --limit 5/minute -j LOG --log-level notice --log-prefix "SYN flood: "
and the test ran much better, which really is quite obvious.
Allthough I would like to optimize the server.