I'm helping a friend out, he's running a CentosOS 6.4 server, with Apache/2.2.24 (Unix) httpd server. His site is running on WordPress 3.81 (latest version) and he's having 30,000 unique page views per day.
He is running this setup on a dedicated Intel Xeon Dual Core, 2.3GHz (4 threads), 5GB RAM server.
His load averages are way above 1 (around 14-16) which I know is wrong. As far as I'm concerned his hardware setup is fair.
Is there anything he can do to optimize his server other than upgrading hardware?
I was told that the plugins might make the troubles, here's a list of the plugins installed:
Askimet , All In One SEO Pack , Configurable Tag Cloud, Contact Form 7, Dave's Wordpress Live Search, Google XML Sitemaps, Multi-column Tag Map, Newsletter, Popular searches tag cloud, Search Metter, SEO Friendly Images, UpdraftPlus - Backup/Restore, Video Thumbnails, Video Thumbnails Pro, Wordpress Mass Email to users, WP-PAGENAVI, WP-PostRatings, WP-PostViews, WP Super Cache
Please let me know if any additional information is needed.