I'm using WP-TUNER to check why my site was loading slow and I found out that it was because of the job manager plugin.
Code Name %DB Time %DB Count DB Time DB Count Category (msec) plugin job-manager 96 99 6,172.1 1831
Table %DB Time %DB Count DB Time DB Count (msec) wp_1iktk2_posts 95 99 6,066.1 1825
Not sure if you want to look into this or not. It was adding 4-10 second overhead on initial page loading and really slowing the site down.
Disabling the plugin had my pages load pretty much instantly. It seems to hang when its activated.