My website is very, very slow. Using Query Monitor, I diagnosed slow HTTP Requests, taking up to 40 seconds (usually 12 secs).
These HTTP Requests are POSTs to http://website.com/wp-cron.php?doing_wp_cron=1476656604.8787710666658495142625
I've tried to disable WP-CRON in wp-config.php with
define('DISABLE_WP_CRON', true); but it changed absolutely nothing.
I have only a handful of cron tasks scheduled, according to Core Control.
The question is: What approach should I take to diagnose and solve this problem? Why would a POST to localhost take so long?