Questions/concerns with WordPress speed issues

Slowness/high CPU usage: – a poor or memory intensive theme – poor or memory intensive plugins – your hosts’ server is slow
Start with reading this article (and follow the links):
– https://www.wptavern.com/determining-which-plugins-are-slowing-your-site-down
– https://wordpress.stackexchange.com/questions/656/is-there-a-way-to-measure-server-resource-cpu-usage-by-wp-plugins/799#799
– also view this WP tv tutorial: https://wordpress.tv/2013/02/28/vinay-paudel-optimizing-and-speeding-up-a-wordpress-site/

Thank you! I will give the P3 Profiler plugin a try. Over the weekend, I found that one of the plugin that utilized the wp_get_nav_menu_items() WP hook to create parent and child pages for navigation was taking up all the MySQL resources. We have over 750 pages and by using the hook, it queried those pages six times on every page load.

A note for those people using similar WordPress functions–these hooks are not optimized for larger websites. Create your own queries that pull in essential parts instead!