Recently my website is extremely slow. We did not change anything on the site but it looks the last automatic update of wordpress made the whole website very slow. I can see the website is using 80% of the CPU. could you please help?

User Domain % CPU % MEM MySQL Processes
estarreg estarregistry.com 79.96 13.48 4.1
mysql 2.66 2.44 0.0
root 1.77 3.06 2.0
cpanelsolr 0.07 5.48 0.0
nobody 0.03 1.23 0.0
dovecot 0.01 0.00 0.0
named 0.00 0.30 0.0
mailnull 0.00 0.10 0.0
nginx 0.00 0.10 0.0
dovenull 0.00 0.09 0.0
dbus 0.00 0.00 0.0
mailman 0.00 0.00 0.0
nscd 0.00 0.00 0.0
sshd 0.00 0.00 0.0

I can drill down and see that php is taking a lot of the resources:

estarreg estarregistry.com 23.6 php-fpm: pool estarregistry_com
estarreg estarregistry.com 23.2 php-fpm: pool estarregistry_com
estarreg estarregistry.com 23.0 php-fpm: pool estarregistry_com

Is there any recommendation? Shall we install any new version of the theme?

I am not proficient at webservers but here’s what you can do that will definitely speed things up for you!

http://blueowlcreative.com/docs/fortuna/#extra2