ispconfig3 debian Apache for Maximum Performance

Hello,

I have Debian Squeeze/Sid) ISPConfig 3.0.5.3 and for some time my websites load very very slow. I have notice that if I restart the apache the websites will start loading fast for short time, then will be slow again.



Can you help me please?

Thank you

 

Looks like some domains from same server loads faster and other very very very slow!
I don't understand why! both are using mysql, but the one witch is loading very very slow has less and simple query.

Any help will be appreciated.

Thank you

 

Here are some extra info:

Apache Processes: 15
total used free shared buffers cached
Mem: 3261 3172 89 0 183 2297
-/+ buffers/cache: 691 2570
Swap: 5815 105 5710


<IfModule mpm_prefork_module>
StartServers 5
MinSpareServers 5
MaxSpareServers 10
MaxClients 150
MaxRequestsPerChild 0
</IfModule>


Private + Shared = RAM used Program

4.0 KiB + 8.0 KiB = 12.0 KiB acpid
4.0 KiB + 11.5 KiB = 15.5 KiB portmap
4.0 KiB + 14.5 KiB = 18.5 KiB rpc.statd
4.0 KiB + 22.0 KiB = 26.0 KiB dbus-daemon
28.0 KiB + 19.0 KiB = 47.0 KiB atd
0.0 KiB + 57.0 KiB = 57.0 KiB udevd (3)
52.0 KiB + 11.5 KiB = 63.5 KiB init
24.0 KiB + 60.0 KiB = 84.0 KiB getty (6)
80.0 KiB + 24.0 KiB = 104.0 KiB logger
92.0 KiB + 22.0 KiB = 114.0 KiB cron
68.0 KiB + 50.0 KiB = 118.0 KiB sh
96.0 KiB + 50.0 KiB = 146.0 KiB mysqld_safe
136.0 KiB + 41.5 KiB = 177.5 KiB master
144.0 KiB + 61.5 KiB = 205.5 KiB pure-ftpd-mysql-virtualchroot
136.0 KiB + 153.0 KiB = 289.0 KiB ha_logd (2)
268.0 KiB + 33.5 KiB = 301.5 KiB dovecot
300.0 KiB + 13.5 KiB = 313.5 KiB dhclient
308.0 KiB + 39.0 KiB = 347.0 KiB ntpd
264.0 KiB + 87.0 KiB = 351.0 KiB tlsmgr
268.0 KiB + 113.5 KiB = 381.5 KiB su
356.0 KiB + 70.5 KiB = 426.5 KiB qmgr
368.0 KiB + 92.5 KiB = 460.5 KiB pickup
472.0 KiB + 114.5 KiB = 586.5 KiB freshclam
592.0 KiB + 34.0 KiB = 626.0 KiB rsyslogd
580.0 KiB + 228.5 KiB = 808.5 KiB proxymap
636.0 KiB + 277.0 KiB = 913.0 KiB dovecot-auth (2)
704.0 KiB + 240.0 KiB = 944.0 KiB trivial-rewrite
788.0 KiB + 231.0 KiB = 1.0 MiB cleanup
1.1 MiB + 36.0 KiB = 1.2 MiB imap
1.1 MiB + 312.0 KiB = 1.4 MiB pop3-login (3)
1.0 MiB + 330.0 KiB = 1.4 MiB imap-login (3)
704.0 KiB + 846.5 KiB = 1.5 MiB sshd (3)
1.1 MiB + 438.0 KiB = 1.5 MiB smtp (2)
1.3 MiB + 300.5 KiB = 1.6 MiB vlogger
1.8 MiB + 70.0 KiB = 1.8 MiB named
1.9 MiB + 434.0 KiB = 2.4 MiB spamd (3)
2.2 MiB + 369.0 KiB = 2.6 MiB fail2ban-server
6.4 MiB + 846.0 KiB = 7.2 MiB bash (2)
24.4 MiB + 98.5 KiB = 24.5 MiB mysqld
31.8 MiB + 10.8 MiB = 42.6 MiB apache2 (16)
52.6 MiB + 13.7 MiB = 66.3 MiB amavisd-new (3)
247.5 MiB + 1.5 MiB = 249.0 MiB clamscan (2)
617.9 MiB + 9.9 MiB = 627.8 MiB php-cgi (23)
---------------------------------
1.0 GiB
=================================


Can someone help me?
The websites are very slow!

Thank you