I am using APC Page Caching on our VPS website. However, I am unable to get the Page Cache Preload to work properly. The only way that pages are being cached is if I manually visit the page (I verify the date/time by looking at the bottom of the page source).
I have the following settings enabled in the Page Cache Preload section:
Automatically prime the page cache: Checked
Update interval: 900 seconds
Pages per interval: 10
Sitemap URL: http://mysite.org/wordpress/page-sitemap.xml
Prime post cache on publish: Checked
My sitemap was generated by Yoast SEO Plugin, so it is a compliant sitemap file. I was reading in another post that the preloading of cache works off of wp-cron. Is there something special that I have to do with setting up a wp-cron job? If so, please explain what needs to be done to trigger the page cache preloading.
Any thoughts or suggestions on making the page cache preloading would be much appreciated.